Hookworms can be fatal to your pet and pet parents need to be vigilant and watch for signs of hookworms. This parasite invades and lives in your pet's small intestine and in their 4th stage larvae, can cause anemia and inflammation of the small intestine. They are transmitted several ways - from their mother's milk, to penetrating your pet's paws or between their toes if there is an entry point such as a scratch or open wound. Active worms leave bite sites which will continue to seep blood. Your veterinarian can test for hookworms by testing your pet's stool, and if present, your they can prescribe a treatment plan. Once treated to kill the parasite, it's suggested to prevent another infestation by treating with prevention medications one time monthly.