A flea is an external parasite of dogs and cats. Fleas look like dark little sesame seeds, crawling around on your pet’s skin. But they can move very fast, so you’ve got to be stealthy to keep ...
Learn more Cats with severe flea infestations can suffer from skin damage, an allergic reaction, and anemia from blood loss. Fleas can also spread parasites like tapeworms and may transmit diseases.