Hookworms in Dogs and Cats: Signs, Treatment, and Prevention

Hookworms are one of the most common intestinal parasites affecting dogs and cats in Florida. These small but dangerous worms attach to the lining of your pet’s intestines and feed on blood, which can lead to serious health problems if left untreated.

What Are Hookworms?

Hookworms (Ancylostoma species) are tiny parasites, typically less than half an inch long, that live inside your pet’s small intestine. Despite their small size, they have hook-like teeth that latch onto the intestinal wall and feed on blood. A single hookworm can consume a surprising amount of blood each day, and heavy infections can quickly become life-threatening — especially in puppies and kittens.

How Pets Get Hookworms

Hookworms have several ways of infecting your pet, which makes them particularly difficult to avoid without preventive care.

Skin Penetration Through the Paws

Hookworm larvae live in contaminated soil and can burrow directly through your pet’s skin — most commonly through the paw pads. Dogs that walk on infected soil in yards, parks, or sandy areas are especially vulnerable. This route of infection is more common in warm, humid climates like ours here in the Tampa Bay area.

Ingesting Larvae

Pets can swallow hookworm larvae while grooming their paws, eating grass, or drinking from contaminated puddles. Once ingested, the larvae travel to the intestines where they mature into adult worms and begin feeding.

From Mother to Offspring

Puppies and kittens can become infected before they are even born. Hookworm larvae can pass through the placenta during pregnancy or through the mother’s milk during nursing. This is why young animals are often the hardest hit by hookworm infections and why early veterinary care is so important.

Symptoms of Hookworm Infection

The signs of hookworms can range from subtle to severe, depending on how many worms are present and your pet’s overall health.

Anemia

Because hookworms feed on blood, one of the most telling signs is anemia. You may notice pale gums, lethargy, and weakness. In puppies and kittens, severe anemia from hookworms can be fatal without prompt treatment.

Bloody or Dark Stool

Hookworm infections often cause dark, tarry stools or visible blood in the stool. This results from bleeding at the attachment sites inside the intestine.

Weight Loss and Poor Coat

Chronic infections can lead to weight loss, poor appetite, and a dull or thinning coat. Your pet may seem generally unwell without an obvious cause.

Skin Irritation

If larvae enter through the skin, you may notice redness or irritation on your pet’s paws or belly, particularly in areas that contact the ground.

How Hookworms Are Diagnosed

Your veterinarian diagnoses hookworms through a fecal examination. A small stool sample is examined under a microscope to look for hookworm eggs. Because eggs may not always appear in every sample, your vet may recommend repeat testing if hookworms are suspected but not initially found.

In young puppies showing signs of severe anemia, your veterinarian may begin treatment based on clinical signs even before lab results are confirmed.

Treatment for Hookworms

Hookworms are treatable with deworming medications prescribed by your veterinarian. Treatment typically involves multiple doses given a few weeks apart to eliminate both adult worms and any larvae that mature after the first treatment.

Pets with severe anemia may need additional supportive care, including iron supplements or in serious cases, blood transfusions. Your vet will tailor the treatment plan based on the severity of infection and your pet’s overall condition.

Preventing Hookworms

Prevention is far easier and less costly than treating an established infection. Here are the most effective steps you can take:

• Year-round parasite prevention: Monthly heartworm preventives also protect against hookworms. In Florida’s warm climate, year-round coverage is a must.
• Regular fecal testing: Annual stool checks (or more frequent testing for puppies) catch infections early before they cause serious problems.
• Clean up after your pet: Promptly removing feces from your yard reduces environmental contamination and breaks the hookworm lifecycle.
• Deworm puppies and kittens early: Because mother-to-offspring transmission is so common, veterinarians typically begin deworming protocols as early as two weeks of age.
• Limit exposure to contaminated areas: Avoid letting your pet walk in areas with heavy foot traffic from unknown animals, especially moist or sandy soil.

Can Humans Get Hookworms?

Yes. Hookworm larvae in contaminated soil can penetrate human skin, causing a condition called cutaneous larva migrans — an itchy, red, winding rash usually on the feet or hands. Children who play barefoot in areas where infected animals have been are most at risk. Keeping your pet on prevention protects your whole family.

Schedule a Parasite Screening Today

If your pet is due for a fecal exam or you have noticed any of the symptoms described above, contact Dunedin Animal Medical Center. Our team can test for hookworms and other intestinal parasites and get your pet started on a prevention plan that works year-round in our Florida climate. Call us at (727) 738-1527 or request an appointment online.