Flea and tick products are repellents, growth inhibitors, or pesticides used to treat or prevent flea and tick infestations in animals, such as cats and dogs. Fleas become infected when they bite infected animals, and when an infected flea bites an animal or person, it causes flea-borne infection. Fleas cause itching and allergic reaction, while ticks transmit infections such as Lyme disease. Although flea and tick products have been utilized in hundreds of millions of cats and dogs worldwide, sometimes adverse reactions or side effects can and do happen.
