Heavy flea infestations and allergic reactions to flea bites can lead to hair loss and open wounds. Worse yet, cat fleas can transmit dangerous diseases to cats and humans.

Your dog (or cat) is losing its hair. ... Fleas on humans. Fleas don't live on humans because we don't have any fur where they can hide. But they will bite you if no animal is around.

Fleas can bite humans, but they live and reproduce on animals, under the protection of fur and feathers. Learn about fleaborne diseases and how to remove fleas from your pets and your home.

Fleas can cause your cat to have skin irritation, a tapeworm infection, and other issues. To learn more, read our guide on how to get rid of fleas on cats.

In felines and canines, eczema can be brought on by human dander, which includes dead skin cells and hair. Pets that are allergic to human dander and share indoor spaces with people will encounter ...