1. Other Animals
Even with a tall fence, squirrels, raccoons, feral cats, and other small rodents will find ways to get into your yard, carrying fleas and ticks along with them. This is one reason not to encourage wild animals to come into your cat’s environment by leaving out offerings such as corn, nuts, and seeds. Cats especially like to sit on windowsills to look out at the world, and an open window, even one that is screened in, is a potential entrance for fleas and ticks.