Hookworms in Dogs & Cats: Signs & Treatment
Start here
Hookworms are small but serious intestinal parasites that hook onto the gut lining and feed on blood. Because they cause blood loss, they can lead to dangerous anemia, weakness, dark or bloody stool, and poor growth — and heavy infections can be life-threatening in puppies and kittens. Pets pick them up from contaminated soil, their mother, or by larvae burrowing through the skin. They're diagnosed with a stool test and treated with deworming medication.
What hookworms are and why they're dangerous
Hookworms (Ancylostoma and Uncinaria species) are tiny — often too small to see easily — but they punch above their weight. They attach to the lining of the small intestine with hook-like mouthparts and feed on blood. A heavy infection can drain enough blood to cause severe, even fatal anemia, particularly in young or small animals.
This blood-feeding is what sets hookworms apart from other intestinal worms: the danger isn't just poor nutrition, it's active blood loss.
How pets get hookworms
Hookworms have several routes of infection, which makes them hard to avoid without prevention:
- From the mother: puppies and kittens can be infected through their mother's milk.
- Swallowing larvae from contaminated soil or feces.
- Skin penetration: larvae in the soil can burrow directly through a pet's skin — often the paws or belly.
- Eating infected prey such as rodents.
Warm, humid environments and areas where many dogs gather (parks, kennels, yards) are common sources.
Signs of hookworm infection
Signs range from subtle to severe depending on the worm burden and the pet's size and age:
- Pale gums and weakness — signs of anemia from blood loss
- Dark, tarry or bloody stool
- Diarrhea and weight loss
- Poor growth, dull coat and low energy
- Failure to thrive or sudden collapse in severe cases, especially puppies
- Itchy, irritated skin on the paws where larvae entered
Practical take: Pale gums plus weakness in a puppy is an emergency — hookworm anemia can be fatal, so call your vet right away.
Diagnosis and treatment
Because hookworms are usually too small to see in stool, diagnosis relies on a laboratory fecal test that detects their eggs. Treatment is effective when started promptly:
- Deworming medication kills the adult worms; a repeat dose after a couple of weeks catches worms that were still maturing.
- Severely anemic pets may need supportive care, iron, fluids, or in extreme cases a blood transfusion.
- Many monthly preventives (including some heartworm products) also control hookworms year-round.
Your vet may recheck a stool sample to confirm the infection has cleared.
Can people get hookworms?
Yes — hookworm larvae can affect people. Larvae in contaminated soil or sand can burrow into human skin, causing an itchy, winding rash known as cutaneous larva migrans, most often on the feet after walking barefoot.
To protect your family: pick up pet waste promptly, avoid going barefoot in areas that may be contaminated, wash hands after gardening or handling soil, and keep pets on year-round parasite prevention. Clean environments and dewormed pets keep the risk low.
Prevention and tracking
Hookworms are best prevented with year-round parasite control, prompt feces cleanup, and regular fecal exams — usually once or twice a year for healthy adults and more often for puppies or high-risk pets. Because prevention only works when it's consistent, it helps to keep a record of preventive doses, deworming dates and stool-test results so nothing slips. Logging these over time keeps you on schedule and gives your vet a clear parasite history at each visit.
Keep parasite prevention on schedule
Tavi lets you log dewormers, monthly preventives and fecal-test results for each pet and reminds you when the next dose is due — so protection against hookworms never lapses. Free for your first pet.
Frequently asked questions
How serious are hookworms in dogs and cats?
Hookworms can be very serious because they feed on blood and can cause dangerous anemia, especially in puppies and kittens where heavy infections can be fatal. Adult pets often show milder signs, but any hookworm infection should be treated promptly by a vet.
What are the signs of hookworms?
Common signs include pale gums and weakness from anemia, dark or bloody stool, diarrhea, weight loss, poor growth and a dull coat. Larvae entering through the skin can also cause itchy, irritated paws. Pale gums plus weakness in a puppy is an emergency.
How do pets get hookworms?
Pets can get hookworms through their mother's milk, by swallowing larvae from contaminated soil or feces, by larvae burrowing through their skin, or by eating infected prey. Warm, humid areas and places where many dogs gather are common sources.
Can humans catch hookworms from pets?
Yes. Hookworm larvae in contaminated soil or sand can burrow into human skin, causing an itchy, winding rash called cutaneous larva migrans, often on the feet. Prompt waste cleanup, wearing shoes outdoors, handwashing and year-round pet prevention keep the risk low.
How are hookworms treated?
Hookworms are treated with deworming medication, usually repeated after a couple of weeks to kill newly matured worms. Severely anemic pets may need fluids, iron or even a transfusion. Many monthly heartworm preventives also control hookworms, and your vet may recheck a stool sample afterward.
Tavi's guides are informational and not a substitute for professional veterinary advice, diagnosis or treatment. When in doubt, call your veterinarian. Sources: Companion Animal Parasite Council (CAPC); Centers for Disease Control and Prevention (CDC); American Veterinary Medical Association (AVMA); Merck Veterinary Manual