9 Best Dog Door To Keep Cats Inside | Keep Your Cat Safe Indoors

Check Price on Amazon

The SmartDoor Connected represents the highest tier of selective-entry technology for keeping cats inside. It uses an electronic key worn on the dog’s collar to unlock the flap, and you can control the door remotely via the My PetSafe app — locking it from anywhere, setting custom schedules for each pet, and receiving notifications when the door is used. The medium size is appropriate for small to medium dogs, and the flap features dynamic weather sealing and a multi-point locking mechanism for energy efficiency.

Installation requires a 1.5-inch door thickness (wood, PVC, or metal). The door pairs with up to 5 keys, and each key can be assigned to a specific pet profile with its own schedule. The new firmware update has addressed earlier connectivity complaints, though some users still report intermittent Wi-Fi drops. The microchip reading capability is limited — metal door frames can interfere with the reader, so most owners rely on the included collar key.

Customer feedback cycles between praise for reliable selective entry and frustration with connectivity and collar-key range. The door is loud when unlocking, which can startle some pets. The plastic frame feels less substantial than the premium price suggests, and the 1-year warranty is standard. For owners who prioritize remote control and schedule customization, this is the most advanced solution available, but it demands a stable 2.4GHz Wi-Fi network and patient setup.

Check Price on Amazon

This classic PetSafe electronic door uses a waterproof collar key that communicates with the door via an infrared sensor. The door unlocks when your dog approaches within roughly 2.5 feet and relocks after 15 seconds, creating a reliable physical barrier that a cat without the key cannot pass. It’s designed for small pets weighing 4 to 15 pounds, making it an ideal match for small dogs like Chihuahuas or Miniature Poodles where the cat is similarly sized or slightly smaller.

The door fits interior or exterior doors with a thickness of 1.5 to 2 inches, and a wall installation kit is available separately. It operates on 4 D-cell batteries (not included), and the sensor has a range of about 2 feet. Owners report that dogs learn the system within 3 to 5 days, and the loud click of the lock mechanism serves as an audible cue. The locking mechanism can be configured for two-way access, entry only, exit only, or fully locked — giving you granular control over when your cat can be supervised.

Customer reviews highlight the door’s consistent performance over several years, with many users reporting 3+ years of daily use before needing replacement. However, some units develop a mode-switching failure after 3-4 years, randomly locking the dog outside. The small size limits the door to tiny breeds, but for its intended use case, it’s a proven, straightforward solution. The 1-year warranty is adequate, but the lack of Wi-Fi or app integration means you can’t lock it remotely.

Check Price on Amazon

The AJKJ Smart Electronic Pet Door offers three modes (Locked, Unlocked, Automatic) and supports pets up to 85 pounds, which fits many larger breeds like Retrievers or Shepherds. It uses one included sensing key on the dog’s collar to unlock the flap, and you can add up to 5 keys total. The door is battery-powered (4 D-cell and 2 CR2032 batteries, not included) and has a maximum compatible door thickness of 3.1 inches.

Installation is straightforward for standard wooden or vinyl doors, but the plastic frame feels less premium than metal alternatives. The sensor sensitivity is adjustable, but the adjustment method requires checking product images because the manual is not always clear. The flap locks with a loud click, similar to the PetSafe model. Some users report that the lock sticks in cold weather, though the door remains functional.

Customer satisfaction is mixed. Positive reviews praise the affordable price point for an electronic door and the ability to keep cats contained. Negative reviews focus on defective units where the collar tag never activates the door, and poor customer service from the manufacturer. The 1-year warranty is standard, but replacement parts are not widely available. For the price, it’s a reasonable entry point into electronic doors for medium-large dogs, but reliability varies by unit.

Check Price on Amazon

The Eillion sliding glass insert is a full-frame solution that replaces a section of your sliding door track. It’s built from an all-metal aluminum frame with a semi-transparent flap that measures 10 inches wide by 16 inches high — one of the largest flaps available, accommodating dogs up to 100 pounds. The insert adjusts from 75 7/8 inches to 81 inches in height, fitting most standard villa and patio sliders. The flap uses a magnetic seal and windproof strips to block drafts.

Installation is a serious project requiring 4 to 6 hours and a drill for mounting into the door frame. The door has a fixed swing direction: if installed on the left side of the glass door, it opens inward; on the right side, outward. This is permanent and not adjustable, so measure carefully before cutting. The metal closing panel slides down to block the opening entirely, which physically prevents your cat from using the door when you lock it. The flap is heavy and dark gray; some dogs hesitate because they cannot see through it.

Customer feedback emphasizes the door’s sturdiness and the fact that it’s one of the few options for very large dogs. However, the heavy flap can blow open in strong wind, and the locking mechanism can impede the sliding door’s full range of motion. Some users needed to add weather stripping for a tighter seal. The permanent installation means you can’t easily remove it. For owners who want a non-electronic, physical barrier that manually controls access, this is a durable choice.

Check Price on Amazon

The MIAOTONG uses a triple-flap design with magnetic closures to create a strong physical barrier that deters cats. Each flap adds resistance, meaning a lightweight cat will struggle to push through all three layers, while a dog of 40-100 pounds can push through with a single shoulder. The frame is constructed from oxidized steel and aluminum with laser welding, making it rust-resistant and very strong. The sliding lock panel allows you to completely block the door when needed.

This door is designed for exterior doors (wood, PVC, or metal) with a thickness of 1.2 to 2 inches. The telescoping tunnel adjusts to fit, but the installation requires a jigsaw or metal snips to cut through the door. The included template and instructions are clear, and the door comes pre-assembled. The triple flaps provide excellent insulation, with users reporting noticeable energy savings compared to single-flap doors. The dark color and stiffness of the flaps can confuse some dogs initially, as they can’t see through the material.

Customer reviews consistently praise the build quality and the generous flap size for the price. The door works well for German Shepherds, Great Danes, and other large breeds. One recurring note is a metallic clinking sound when the flaps open and close, which is minor but present. Some dogs hesitate because the flaps are heavy and opaque. The 1-year warranty is standard, but the all-metal construction suggests a longer lifespan. It’s an excellent non-electronic option for physically excluding cats via flap stiffness.

Check Price on Amazon

The Eillion medium wall door is designed for installation through an exterior wall rather than a door, making it ideal for homes where door mounting isn’t practical. It features three flaps for weather insulation and uses magnetic closures to keep drafts out and flaps closed between uses. The telescoping tunnel expands from 4.1 inches to 7.1 inches, accommodating a wide range of wall thicknesses. It accommodates pets up to 40 pounds, making it suitable for medium dogs and large cats, but not large or giant breeds.

Installation requires cutting a 9.2-inch by 14.6-inch hole through your wall, and the package includes a template and clear instructions. The all-metal frame is laser-welded for strength, and the unit comes with a metal closing panel for additional security when you want to block access entirely. The triple-flap design provides 50% better insulation than single-flap alternatives, according to the manufacturer. The magnetic closure ensures the flaps return to their original position after each use.

Customer reviews emphasize the build quality and the fact that the door fits thick walls without problems. Some users found that the closing plate interfered with the spring lock mechanism, requiring a simple file adjustment. The door is effective for keeping cats inside if the flap is stiff enough for them not to push through, but a determined cat may eventually learn. The 1-year warranty covers defects. This is a good choice if you want to avoid cutting your door and need a permanent wall solution.

Check Price on Amazon

The PetOasis window insert is a no-drill solution for sliding windows with a width between 32 and 36 inches. It installs in about 10 minutes using only hand tools and requires no damage to walls or doors. The flap opening is 7.8 inches wide by 10.6 inches high, suitable for cats and extra-small to small dogs. The frame is aluminum, and the flap uses a magnetic closure with weatherstripping to seal against wind and rain. The spring mechanism on both sides allows for quick removal and reinstallation.

The door features four locking modes: two-way closing, two-way opening, outward opening only, and inward opening only. This gives you control over whether your cat can exit or enter. The magnetic closure is strong — several reviewers note that their cats took weeks to learn to push through it. If your cat can’t manage the magnet, they stay inside. The acrylic flap is clear, but it scratches more easily than polycarbonate alternatives. Weatherstripping includes foam bumper seals and vinyl draft seals.

Customer feedback is very positive, with an average rating near 5 stars. Users praise the sturdy construction, good insulation, and secure magnet close. Some owners reported that the spring screws loosened over time and required tightening. The 3-year after-sales service is generous. This is an excellent option specifically for keeping cats inside if they lack the strength to push a stiff magnetic flap, but it will not work for dogs that are even slightly larger than the 7.8-inch wide opening.

Check Price on Amazon

The Dreampedal insert is a budget-friendly alternative for sliding glass doors. It adjusts in height from 76.38 inches to 81.1 inches, fitting most residential sliding door tracks. The flap opening is 8.66 inches wide by 11.81 inches high, suitable for pets up to 40 pounds. The frame is aluminum, and the flap uses a sliding lock mechanism. The insert comes with a panel that slides up and down and can be locked to completely block the opening when you want to contain your cat.

Installation requires minimal tools and no permanent modifications to the door frame — the insert sits in the track. However, some users report that the panel may be slightly wider than the track, requiring alternative mounting or shimming to fit flush. The sliding lock is described as weak by some owners, and the flap can let in drafts if not perfectly sealed. The included instructions are not detailed, and the screw-based height adjustment requires a Phillips screwdriver. The frame feels less robust than more expensive alternatives.

Customer reviews are mixed. Positive comments highlight the ease of assembly and the fact that it’s the third such door the buyer has used, calling it the easiest to put together. Negative feedback focuses on fit issues with non-standard tracks and gaps that allow drafts. The slider panel works well for keeping cats inside when locked, but the flap itself doesn’t have strong magnetic closure, so a determined cat might push through if the locking panel isn’t engaged. For the price, it’s a functional entry-level solution.

Check Price on Amazon

While not a traditional dog door, the No Pawblems gate solves the cat-containment problem indoors by physically separating pets within the home. The gate is 55 inches tall with 1.37-inch bar spacing, which prevents all but the most athletic cats from jumping over. It includes a 7-inch by 5.5-inch adjustable cat door that can be positioned left or right at two height levels. The gate uses pressure mounting (no drilling required) and works for doorways and hallways ranging from 29 to 43 inches wide.

The gate has an auto-close feature with a gentle swing, plus a stay-open option for hands-free convenience. The double-lock mechanism allows one-handed operation. The cat door itself locks in place with a sliding latch, meaning you can close the small door to block your cat from passing through while your dog uses the main gate or a separate door. The gate is sturdy enough to withstand 75-pound dogs leaning against it, though the plastic hinge is the weak point and may break if forced past the open stop.

Customer feedback is very positive for pet separation, with many owners using it to keep a large dog away from cat food or a litter box. Some reviewers note that determined cats (especially kittens) may learn to climb the gate. The pressure mount is safe for containing cats but may require wall screws for very energetic or large dogs. The plastic hinge and lock mechanism are not replaceable with standard parts, but the manufacturer will replace defective units. This is a practical solution for households where the dog uses a separate door and you need to block cat movement within the house.