If you own a dog over 50 pounds and want them to come and go on their own without letting raccoons, stray cats or the neighbour’s dog into your house, the shortlist narrows fast. Our pick for most large-dog households is the High Tech Pet Power Pet Smart Automatic in the Large wall-mount size: it serves dogs up to 100 pounds, unlocks with an ultrasonic collar key, and adds a steel dead bolt that keeps the opening secured when the panel is closed.
This roundup covers six powered dog doors that genuinely suit large and giant breeds, from a plastic-frame RFID door that most owners can install in an afternoon to a stainless steel model rated for 125 pounds and a collar-scheduled door scaled to 200 pounds. Every door here unlocks only for your dog, so you keep selective entry without giving up a big opening.
We looked at opening size against actual dog weight, activation technology, how the door behaves when batteries die, and what owners report after months of daily use in rain, mud and cold. Prices change constantly, so use the check buttons for current pricing rather than any number you may remember from elsewhere.
Table of Contents
Top 3 Picks for Large Dogs (October 2026)
High Tech Pet Power Pet…
- Ultrasonic collar recognition
- Dogs up to 100 lbs
- Automatic steel dead bolt
- Wall or door mount
PetSafe Electronic SmartDoo…
- RFID collar key activation
- Up to 5 programmed keys
- Entry-only and auto-lock modes
- Sensitivity control
High Tech Pet Power Pet…
- 12.25 x 16 inch opening
- Built for 30 to 100 lb dogs
- Air-tight aluminum panel
- Directional sensing
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The wall-mount Power Pet earns the top slot on the balance of rating, review volume and build: a hermetically sealed sliding panel, directional sensing that refuses false triggers, and US-based support. The PetSafe SmartDoor is the cheapest route into selective entry with an RFID collar key, and the PX-2DM is the cleanest install if you would rather cut a hole in an existing back door than a wall.
Smart Dog Doors for Large Dogs at a Glance in 2026
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High Tech Pet Power Pet Smart Automatic, Large Wall Mount
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PetSafe Electronic SmartDoor Large with Extra SmartKey
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Check Latest Price |
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High Tech Pet Power Pet PX-2DM Door Mount
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Check Latest Price |
 PlexiDor Performance Electronic Dog Door Large Wall Mount
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Check Latest Price |
 Aiday X-Large Automatic Dog Door with Sensor Collars
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Check Latest Price |
 High Tech Pet Power Pet Roll Up WiFi X-Large
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Check Latest Price |
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1. High Tech Pet Power Pet Smart Automatic, Large Wall Mount
Power Pet Smart Automatic Electronic Pet Door by High Tech Pet (Wall Mount, Large, Non-WiFi)
- Dogs up to 100 lbs
- Ultrasonic MS-5 collar
- 37 lb unit, 2 x 16 x 40 inch
- AC adapter plus optional battery backup
Pros
- Serves large dogs up to 100 lbs
- Directional sensing avoids false opens
- Automatic steel dead bolt and anti-pinch system
- Hermetic weather seal
- Quiet operation and responsive US support
Cons
- Collar batteries need changing every 6 to 8 weeks
- Thick walls need a separate tunnel
- Some units hit sensor or board failures over time
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This is the door I would put in most large-dog homes. One owner on r/dogs described exactly the outcome we look for: “I have the high tech pet door and love it and it was sooo easy to train the dogs to go in and out.” That combination of reliable reading and fast training is what separates this door from cheaper collar-activated models.
The activation method is ultrasonic. The included MS-5 collar emits a signal the sensor picks up as your dog approaches, and directional sensing means the panel only lifts when the dog heads straight at the opening rather than passing nearby. Control modes cover In Only, Out Only, In and Out, and Locked, which lets you stage training and lock the door at night.
Security is the strongest argument here. A steel dead bolt throws as soon as the panel seats, and the auto-retract system reopens if something is caught in the way. The hermetically sealed sliding panel blocks wind and rain far better than a magnetic flap, which matters in winter when your heating bill is already climbing.
What you trade away is collar maintenance. The MS-5 is a water-resistant collar that needs batteries replaced every six to eight weeks, and if one dies your dog cannot get in. Reviewers also report needing a separate tunnel for standard 2×6 wall construction, plus a handful of long-term sensor, cable and circuit board failures on units that had run for years.
What you need to know before cutting into a wall
The Large size is wall-mount capable but works equally well in a door, and the unit itself weighs 37 pounds, so two people should handle the lift. Because the dead bolt locks an empty opening, critters can shelter in the tunnel when the door is locked, which is the single most common complaint owners raise about the powered panel.
Who it suits and who should pass
Choose this if you have a dog between roughly 40 and 100 pounds, you want a solid seal in cold weather, and you can commit to checking the collar battery every couple of months. Skip it if you own several dogs and do not want to collar-track them all, or if your walls are thicker than the standard tunnel without buying an extension.
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2. PetSafe Electronic SmartDoor Large with Extra SmartKey
PetSafe Electronic SmartDoor – White, Large with Extra SmartKey
- RFID SmartKey collar activation
- Up to 5 programmable keys
- Entry, exit and auto-lock modes
- Adjustable sensitivity
Pros
- Lowest-cost electronic large dog door here
- Simple RFID key programming
- Useful entry-only and auto-lock modes
- LED status indicators
- No wiring to the door
Cons
- Plastic frame is less rigid than metal rivals
- Collar keys need batteries
- Large tall dogs may need sensitivity tweaks
- No app or scheduling beyond basic modes
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The PetSafe Electronic SmartDoor in Large is the value pick, and it has the largest review base of any door in this roundup at 158 ratings. It does one job well: reading an RFID SmartKey on your dog’s collar and unlocking the plastic flap so only that dog passes.
Programming takes about a minute. You hold the button to pair a key, and you can register up to five keys on a single door, so a two-dog or three-dog household is covered without extra hardware. Modes are set on the unit itself: entry-only for dogs that only need to get back in, exit-only, or auto-lock once the flap closes.
The collar tag approach is the main reason buyers like this door. It needs no microchip implantation and no wall wiring, and a spare key can be bought directly, which matters in a multi-dog home. Sensitivity control on the unit lets you tighten or loosen the read so a passing neighbour dog does not trigger it.
The compromises are physical. The frame is plastic, so it flexes more than the aluminium or stainless models, and reviewers with very tall, broad dogs report that the sensitivity dial needs adjusting for a reliable first read. As with any battery collar key, a flat key battery means a locked-out dog until you swap it.
How the SmartKey compares to microchip and ultrasonic
RFID SmartKey tags are the simplest activation method available: no surgery, no pairing to a chip reader, and replacement keys are widely available. Microchip readers have the advantage of working with no collar hardware at all, while ultrasonic systems like the MS-5 tend to read from a slightly wider approach angle. Neither difference matters much once you tune sensitivity.
Who it suits and who should pass
This is the right door for a first-time buyer, a rental or a household with one or two dogs where budget matters more than metal framing. Pass if you need remote control from your phone, if you want a flush airtight seal in a cold climate, or if your dog is over 100 pounds and can lean on the flap.
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3. High Tech Pet Power Pet PX-2DM Door Mount
Power Pet Automatic Electronic Pet Door by High Tech Pet – Pet Operated Dog Door, High Security, Air Tight, for Large Dogs 30-100 lbs. (12 1/4″ x 16″ Pet Opening), Door Mount, Easy Install – PX-2DM
- 12.25 x 16 inch pet opening
- Built for dogs 30 to 100 lbs
- Aluminum door-mount frame
- Fits walls up to 2 inches
Pros
- Sized specifically for large dogs
- Air-tight sealed aluminum panel
- Directional sensing blocks false opens
- Dead bolt plus anti-pinch safety
- No wall tunnel needed
Cons
- Collar batteries need periodic replacement
- Frame suits only about 2 inch thickness
- Genuine MS-5 collars required for warranty
- Small sensing delay before opening
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The PX-2DM is the same ultrasonic Power Pet engineering as the wall-mount model, sized for a 12.25 by 16 inch opening and specified for dogs between 30 and 100 pounds. It is a door-mount unit, which changes the installation story completely.
Because it mounts in an exterior door rather than a wall, you avoid the most permanent part of the job. No masonry cutting, no tunnel, and if the door is ever replaced the pet door comes out with it. The aluminium frame and hermetically sealed panel still give you the tight, weatherproof closure that the plastic competitors cannot.
Directional sensing is the feature owners praise most. A dog lying beside the door or trotting past it will not trigger the panel, which removes the false openings that make some dogs stop trusting a powered door. The automatic steel dead bolt then secures the opening the moment the panel shuts.
Two limits stand out. The frame is built for a maximum wall thickness of about 2 inches, so it will not work in a deep wall without a different unit. Owners also note a brief sensing delay before the panel is fully open, which is noticeable to a dog that stops and waits rather than pushing through.
When door mount beats wall mount
Choose door mount if your back door is a standard storm door or a hollow-core slab with enough thickness, and if you ever want the door back to normal. Choose wall mount if you want the opening to sit out of the swing of the door, if you have masonry that only takes a tunnel, or if you are adding insulation value on a cold exterior wall.
Who it suits and who should pass
This suits most homes with a single exterior door facing a yard, especially owners who want a powered door without a contractor involved. Pass if you have a Great Dane or Mastiff over 100 pounds, if your door is unusually thin or thick, or if you want to avoid collar batteries entirely.
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4. PlexiDor Performance Electronic Dog Door Large Wall Mount
PlexiDor Performance Pet Doors Electronic Dog Door Large White Wall Mount
- Rated for dogs up to 125 lb
- 32 lb stainless steel unit
- Battery-free RFID collar keys
- 5-year limited residential warranty
Pros
- Handles dogs up to 125 pounds
- Battery-free keys remove lock-out risk
- Quarter inch stainless steel dead bolt
- Fits walls up to 12 inches thick
- 5-year residential warranty
Cons
- Most expensive door in this group
- Short sensing range on tall dogs
- Long-range sensor sold separately
- Audible motor and panel
- Louder than flap-style competitors
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PlexiDor takes a different approach from every other door here: instead of a hinged flap, a hardened ABS panel slides up and down like a small electronic garage door. At 32 pounds with a stainless steel frame and a quarter inch stainless steel dead bolt, it is the most physically substantial option for a house with a very large dog.
It is rated for dogs up to 125 pounds, which puts it above every other powered door in this group except the X-Large scheduling model. A builder on r/homeautomation put the appeal plainly when looking for large-breed options: “For large breed dogs the only option I’m aware of is Plexidoor so it should be easy to compete on price.”
The collar keys are the standout detail. They are waterproof RFID tags that weigh less than an ounce and hold no battery at all, which removes the most common lock-out failure in this category entirely. One-touch programming adds or changes thousands of key codes, and the open-time setting controls how long the panel stays raised.
Installation is where this door earns its keep in older homes. It fits stud, brick, block or cement walls up to 12 inches thick, so it handles the deep exterior walls that rule out the door-mount and shallow-tunnel models. The manufacturer covers it with a five year limited residential warranty that includes parts and standard freight.
Where the sensing range catches people out
The default read zone is short, so a tall or long dog has to step fully up to the door before the key registers. A long-range sensor can be requested separately through customer service. Set that expectation before install day, because a dog that waits for a door that never opens will stop trying.
Who it suits and who should pass
Pick this for a giant breed, a brick or concrete wall, a rural property where a steel dead bolt matters, or a household unwilling to gamble on collar batteries. Pass if your budget is fixed, if you need the door to keep operating through a power cut, or if a loud motor and panel would bother you or frighten a nervous dog.
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5. Aiday X-Large Automatic Dog Door with Sensor Collars
Automatic Dog Door for Wall with Collar Sensors, XLarge Smart Pet Door for Wall, Custom Scheduling & Anti-Pinch, Fits Extra Large Dogs up to 200 lbs(X-Large)
- Rated for dogs up to 200 lb
- 13.4 x 23.1 inch flap
- Two sensor collars included
- Switchable 20-28 or 35-43 inch sensing
Pros
- Rated for dogs up to 200 pounds
- Two sensor collars included
- One-button sensing range switch
- Custom scheduling with manual override
- Dual flaps with anti-pinch reversal
Cons
- Only 7 reviews so far
- Needs a 14.6 x 25.6 inch wall cutout
- Plug-in power with no battery backup
- Patent still pending
- Replacement collars come from the seller
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This is the largest opening in the roundup by a wide margin. The clear flap measures 13.4 by 23.1 inches inside a 14.6 by 25.6 inch cut opening, and the door is rated for dogs up to 200 pounds. If you own a Great Dane, a Mastiff or a Saint Bernard, no other powered door here has the clearance.
Two sensor collars are included, and the sensing range switches between 20 to 28 inches and 35 to 43 inches with a single button. That range control solves the most common complaint in this category, where marketing overstates the read distance and a hesitant dog stands waiting in the rain.
Scheduling is built into the unit and works without an app. You set the hours the door will read the collars, and it ignores them outside that window, which stops midnight escapes. Manual override is on the unit, and an extra-large display keeps the settings visible instead of buried in menus. The door auto-locks eight seconds after your dog exits.
Construction is sensible: an aluminium frame with an expandable tunnel for walls from 4.1 to 7.1 inches, dual clear flaps with anti-pinch reversal, and magnetic seals for weather. Power comes from a wall plug with an extension cord included, and there is no battery backup, so an outage closes the door rather than leaving it open.
What to weigh before ordering
The cut opening is large and permanent, so measure your wall carefully and check for studs, wiring and a safe power outlet before you start. The expandable tunnel covers common wall thicknesses but not every masonry wall, and a pro install is wise if you have never cut a large opening.
Who it suits and who should pass
Choose this if your dog is over 150 pounds, you want on-door scheduling without an app, or you want a big enough opening that a bulky dog never hesitates. Pass if you need long-term reliability evidence, if you cannot service a 14.6 by 25.6 inch cut, or if a plug-in-only power supply is a problem in your setup.
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6. High Tech Pet Power Pet Roll Up WiFi X-Large
Power Pet Smart Roll Up Automatic Dog Door, WiFi (X-Large, Door Mount)
- WiFi and smartphone app control
- Remote lock and open history
- X-Large sizing
- 24 lb unit, walls up to 6 inches
Pros
- Only app-connected door here
- Remote open
- lock and activity log
- Roll-up panel clears the whole opening
- Adjustable collar sensor sensitivity
- Quiet smooth closing
Cons
- App needs re-pairing to change settings
- Notifications can arrive late or miss events
- Thin collar sensor needs a tight fit
- Short sensing range
- Battery backup pack not included
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This is the only WiFi-controlled door in the group, and for some households that is the entire reason to buy it. You can unlock, lock and pull the open and close history from your phone, which turns pet access into something you can manage while at work or away for a few days.
The mechanical design is unusual too. The composite panel rolls up and disappears behind the unit, so the whole opening stays clear and the profile against the wall stays shallow. X-Large sizing targets giant breeds, and the mount works in a wall, a door or a sliding patio door.
Training goes quickly with the collar sensor. Owners report dogs learning the trigger in about fifteen minutes, and the adjustable sensitivity stops the door firing when a dog merely walks past. Closing is quiet and smooth, and the anti-pinch function protects a paw or tail that lingers in the frame.
The app is the weak point. Reviewers describe needing to delete and re-add the door to change settings, and push notifications that arrive late or skip events entirely, so the activity log should not be your only security record. The collar sensor itself is thin, which makes collar fit important, and the sensing range is short enough that the dog must approach closely.
Is app control worth it for a large dog?
It is worth it when you want to let a sitter or family member manage access, or when you want to lock the door remotely on a schedule. If nobody will use the phone features, a non-WiFi model does the same physical job with fewer ways to fail and one less device on your network.
Who it suits and who should pass
Pick this if remote control matters to you, if you want a shallow-profile panel that clears a sliding patio door, and if you are comfortable troubleshooting a phone app. Pass if you need a guaranteed seal and quiet operation above all, if you want the model to work during an outage out of the box, or if you dislike managing connected devices.
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How to Measure a Large or Giant Breed Dog
Weight alone is a poor guide. A broad-chested Labrador and a leggy Collie can weigh the same and need very different openings, and plenty of doors are advertised for large dogs while offering a flap your dog has to duck through. Measure the dog, then measure the opening, not the frame.
Start with shoulder height. Have your dog stand on level ground and measure from the floor to the top of the shoulder blade, then add two to three inches of clearance. Next take chest width at the widest point, usually just behind the front legs, and make sure the flap opening is wider than that measurement.
Then compare against the openings in this roundup: 12.25 by 16 inches on the PX-2DM, 13.4 by 23.1 inches on the X-Large scheduling door, and the sliding full-height panel on the steel-framed model rated to 125 pounds. If your dog’s measurements sit close to the top of a range, step up a size rather than hoping.
For giant breeds the rule is simple. If your dog clears 100 pounds, the standard Large doors in this group are the limit of their stated capacity, and you should be looking at the 125 pound and 200 pound models or a professional installation with a custom tunnel.
How Smart Dog Door Technology Actually Works
Selective entry means the door recognises your specific animal and unlocks for nobody else. A sensor mounted in or around the frame reads a unique identifier as the dog approaches, the panel opens, and the lock re-engages once the dog is clear. Everything else is a variation on how that identifier travels.
Collar-key RFID is the most common. A battery-powered tag on the collar sends a radio signal to the door. Ultrasonic systems use a sound-based signal instead, which is what the MS-5 collar on the High Tech Pet doors uses. Microchip activation reads an implanted chip as the dog’s head enters the tunnel, so there is no collar hardware to lose or drain.
WiFi models add a fourth layer. The door still reads a collar sensor, but a connected app adds remote locking, scheduling and an activity history. The tradeoff is a device that depends on your phone and your network behaving, and reviewers consistently report that the apps lag behind the physical hardware.
Every method has one failure mode worth planning for. Battery collar keys lock a dog out when the key dies, ultrasonic and RFID reads need the dog to approach at the right angle, microchip readers depend on chip position, and app-connected doors can drop events from the log. Owners who keep spare collar keys and check batteries monthly never hit this problem.
Installation, Power and Outage Behaviour
Door mounting is the friendliest route. The PX-2DM fits a standard exterior door and needs no tunnel, and the roll-up WiFi model also suits door and sliding patio mounts. You are cutting a rectangle in a panel you can replace, not in your house.
Wall mounting is more permanent and more capable. The steel-framed model accepts walls up to 12 inches thick including brick, block and cement, while the X-Large scheduling door uses an expandable tunnel from 4.1 to 7.1 inches. A wall cutout cannot be reversed, so if you rent, check your lease before you start.
Power behaviour differs more than most listings suggest. The two High Tech Pet doors run on the included AC adapter with an optional rechargeable battery backup, the PetSafe SmartDoor is battery-driven, and the X-Large scheduling door is plug-in only with no backup mentioned. The one thing none of them do is keep a battery-free collar key alive during an outage, which is a point in favour of battery-free RFID tags if you have unreliable power.
Outage behaviour worth planning around: a dead collar key battery means a locked-out dog, not an open door. Keep one spare programmed key per dog, check batteries on a schedule, and if you want your dog to reach the yard during a storm you should keep a manual bypass or a human-access path in mind.
Who Should Skip a Smart Dog Door
Renters should skip any wall-mounted model. The cutout is permanent and you will likely be paying to remove it when you move, which erases the value of the door.
If you have a small dog, or no unwanted animals in your area, a solid manual flap with a magnetic seal does the same job for a fraction of the cost and with nothing to break. Powered doors make sense when something other than your dog is trying to get in.
If you are not willing to maintain collar batteries, start with a battery-free key model rather than a key-based door you will resent. And if nobody in the household will use an app, skip the WiFi model and put the money into frame material and a tighter seal instead.
Frequently Asked Questions
Which brand of smart dog door is the best?
For most large-dog households, High Tech Pet’s Power Pet is the strongest all-round choice, with a 4.5 rating across 148 reviews, ultrasonic collar recognition, directional sensing and an automatic steel dead bolt. PlexiDor is the pick for giant breeds and masonry walls with its 125 pound rating and five-year warranty. PetSafe’s Electronic SmartDoor is the budget option with RFID keys and up to five programmed keys.
What are the best automatic dog doors for large breeds?
The best automatic dog doors for large breeds are the High Tech Pet Power Pet Large wall mount for dogs up to 100 pounds, the PlexiDor Performance door for dogs up to 125 pounds in thick or brick walls, and the Aiday X-Large scheduling door rated to 200 pounds. All three unlock only for your dog and relock automatically once the dog has passed through.
What are people saying about the high-tech pet door?
Owners of large dogs generally praise reliable automatic access, quiet operation and responsive US-based customer support, and dogs commonly learn the door within a few days. Recurring criticisms are the need for a separate wall tunnel on thick walls, ultrasonic collar batteries needing replacement every six to eight weeks, and a small number of long-term sensor or circuit board failures.
What size dog door does a Great Dane need?
A Great Dane typically needs an opening with roughly two to three inches more height than its shoulder measurement, and enough width for its chest. In this roundup that points to the 13.4 by 23.1 inch clear flap on the X-Large door rated to 200 pounds. Standard Large doors topping out at 100 pounds are too small for most Great Danes.
How do smart dog doors work?
A sensor in the frame reads your dog’s identifier as it approaches, the panel unlocks, and the lock re-engages once the dog is clear. Identifiers include battery-powered RFID collar keys, ultrasonic collar signals like the MS-5, implanted microchips, and on WiFi models a collar sensor combined with app-based remote control and scheduling.
What happens to a smart dog door during a power outage?
It depends on the model. Doors running on an AC adapter with an optional rechargeable backup pack keep working if you buy the backup, plug-in-only models such as the X-Large scheduling door stop operating entirely, and battery collar keys can die in any weather regardless of the door’s power. Check each model’s manual before relying on access during an outage.
Are microchip dog doors better than collar activated?
Collar activation is simpler because there is no surgery and spare keys are easy to order, but keys need batteries and can lock a dog out. Microchip doors avoid collar hardware entirely and cannot be lost, though they cost more and depend on the chip being positioned correctly as the dog’s head enters the tunnel.
What can I use instead of a doggie door?
Options include a pet-safe sliding glass panel for patio doors, a screened pet door insert that stops a cat or raccoon pushing through, a window perch with dog stairs, or a GPS pet fence if you mainly need to keep the dog in the garden rather than let him in and out of the house.
Conclusion
Six doors, one clear winner. For a large dog in the 40 to 100 pound range, the High Tech Pet Power Pet Smart Automatic wall mount is the best smart dog door for large dogs you can buy right now, because it combines a hermetic seal, a steel dead bolt and directional sensing with the strongest rating and review history in the group.
Step up to the PlexiDor for a giant breed or a brick wall, or to the X-Large scheduling door if your dog weighs more than 150 pounds and you want built-in access hours. Go with the PetSafe SmartDoor if cost is the deciding factor, and pick the roll-up WiFi model only when remote control from your phone is worth an imperfect app.
Whichever one you choose, measure your dog’s shoulder height and chest width first, confirm the flap opening rather than the weight rating, and set a calendar reminder for collar batteries. Those three steps prevent nearly every complaint we read about powered doors.