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While doggie doors are convenient for pet owners, they do offer a few drawbacks. For instance, they’re small enough that unwanted critters could come into the house, such as raccoons, snakes, rats, and insects.

They’re also large enough that small children can escape through them, which can be a serious concern to parents of young children.

Finally, doggie doors can make it difficult to regulate your home’s temperature because they constantly let in hot or cold outside air.

Foxes hate strong scents and sudden disturbances. They dislike the smell of ammonia, vinegar, garlic, chili peppers, and predator urine, which can make an area less appealing. Motion-activated lights and sprinklers also unsettle them, as foxes prefer to avoid sudden movements and bright lights. Additionally, they are wary of loud noises and unexpected sounds.

Squirrels hate not having access to secure shelter or food sources. Your best line of defense is to make your property less attractive by removing access to these things. There are chemical squirrel repellents, but these have mixed success. According to Pennsylvania State University, you can apply products containing the bittering agent denatonium saccharide to a squirrel's favorite fence, tree, or roof spots. However, you need to reapply repellents regularly, which aren’t scientifically proven effective.

Vinegar can keep some animals at bay, like deer, rabbits, foxes, and raccoons. Keep in mind that your household pets, like cats and dogs, also don’t like the smell of vinegar. You can soak rags in white vinegar and put them up around your garden beds to keep the pesky critters from eating your plants.