How to Keep Stray Cats from Coming in Dog Door?

Having a furry friend in your household is a delight, but the sudden intrusion of unwanted guests, such as stray cats slipping through your dog door, can be a nuisance. Stray cats are resourceful creatures, and once they discover an entry point, they might see your home as a potential shelter or a source of food. 

Fortunately, there are effective strategies to deter these feline intruders while ensuring your dog’s ease of access. In this article, we’ll explore various methods to keep stray cats from using your dog door and turning your home into their own personal playground.

Understanding the Problem

Stray cats are known for their adaptability and survival skills, making them quite the challenge to keep out. Dog doors, designed to grant easy access to your dog, often become an unexpected entryway for these nimble cats. 

The problem becomes even more pronounced if your dog is docile and the cat aggressive, leading to territorial disputes. It’s crucial to address this issue promptly to maintain your pet’s safety and peace of mind.

Correct Sizing and Training

Choosing the right-sized dog door is the first line of defense against stray cats. Opt for a door that’s specifically designed for your dog’s size, minimizing the gap that a cat could exploit. If you already have a larger dog door, consider installing a secondary barrier, such as a sliding panel, to narrow the passage further.

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Additionally, training your dog to use the door while excluding the cats can be a valuable solution. Utilize treats and positive reinforcement to condition your dog to go through the door on command. This will help your dog become more confident and agile in using the door, making it less likely that a stray cat can follow suit.

Motion-Activated Devices

Incorporating motion-activated devices can be an effective way to discourage stray cats from entering your home. These devices emit sudden bursts of water, noise, or light when triggered by motion, startling and deterring any uninvited feline visitors. 

Place these devices near the dog door and adjust their sensitivity to ensure they activate only when larger animals, like dogs, approach the door.

Scent Deterrents

Cats are highly sensitive to smells, and using scents they dislike can help create a barrier around your dog door. Citrus peels, essential oils (such as citronella or eucalyptus), or even coffee grounds can be placed strategically around the entrance. 

The strong odors will discourage cats from approaching the area, reducing the likelihood of them entering through the dog door.

Install a Cat-Proof Barrier

Consider adding a physical barrier specifically designed to deter cats from entering through the dog door. Cat-proof barriers are usually made of mesh or wire and are placed over the dog door’s opening. 

These barriers have small enough openings to prevent cats from squeezing through while still allowing your dog to use the door comfortably.

Create an Alternative Entrance for Cats

One creative approach is to provide an alternative entrance for the stray cats, away from your dog door. Set up a separate area with a small shelter, food, and water specifically for the cats. This could redirect their attention and create a more welcoming environment elsewhere, leaving your dog door untouched.

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Regular Maintenance

Maintaining your dog door and its surrounding area is crucial in keeping stray cats at bay. Regularly clean the area to remove any scents or food particles that might attract cats. Conduct routine checks on the dog door’s condition to ensure there are no gaps or loose parts that a cat could exploit.

Seek Professional Help

If the stray cat problem persists despite your efforts, seeking advice from a professional animal behaviorist or a local animal control agency is a prudent step. They can provide customized solutions based on the specific dynamics in your area and help you create a cat-friendly environment while keeping them away from your dog door.


While stray cats might be persistent, employing a combination of preventive measures can effectively keep them from entering your home through the dog door. 

By selecting the right-sized door, training your dog, using motion-activated devices, employing scent deterrents, installing cat-proof barriers, providing alternative entrances, and maintaining the area, you’ll ensure a safe and peaceful living environment for both your dog and yourself. 

Remember, with patience and a strategic approach, you can maintain control over your home and enjoy the companionship of your canine companion without the intrusion of unwanted feline visitors.