Hookworm in Dogs: Signs, Treatment & Prevention

Hookworms cause otherwise healthy adult dogs to experience gastrointestinal upset. However, this parasite can be fatal for puppies. Here, our vets in Madison share facts about hookworms in dogs and how these problematic parasites can be treated and prevented. 

What are Hookworms?

These small parasites with hook-like mouthparts are commonly found in dogs and cats. Despite their size, which ranges from about 1/4" to 3/4", hookworms can consume a considerable amount of blood once they attach to the intestines of your pet.

If your pet becomes heavily infected with hookworms, it can lead to anemia or inflammation of the intestine.

Hookworms thrive in moist and warm environments, often affecting pets living in overcrowded or unsanitary conditions.

How do Dogs Get Hookworms?

Dogs can become infected with hookworms in one of four ways:

  • Larvae can penetrate your dog's skin leading to infection. 
  • A dog can easily ingest hookworm larvae when grooming their feet, or by sniffing at contaminated feces or soil. 
  • Unborn puppies can contract hookworms via the mother's placenta in utero. 
  • Once born, puppies can contract hookworms through the milk of an infected mother. 

What is the Lifecycle of the Hookworm?

The hookworm lifecycle has three stages, including egg, larvae and adult. 

  • Adult hookworms lay microscopic eggs within a pet that's been infected. These eggs are then passed through the feces, where they hatch into larvae and contaminate the environment. 
  • Larvae can survive for weeks or even months before infecting an unsuspecting dog. 
  • Once the larvae make their way into your pooch's body, they migrate to the intestine, where they mature into adults and lay eggs. The cycle then begins again. 

What are the Symptoms of Hookworms in Dogs?

The primary symptom of hookworms in dogs is intestinal upset. Other symptoms may include:

  • Dry, dull coat
  • Coughing
  • Generalized weakness
  • Pale gums 
  • Significant (unexplained) weight loss
  • Failure of the puppy to grow or develop properly 
  • Bloody diarrhea 
  • Skin irritations (especially around paws)

If your dog is displaying any of these signs of hookworms, contact your vet right away. It's not uncommon for young puppies to die from severe hookworm infections. 

How are Hookworms Diagnosed?

Hookworms can be detected through a fecal flotation test, which is a simple and common diagnostic method.

Your veterinarian will ask you to provide a fresh stool sample from your dog. The stool sample will be mixed with a special solution that causes any hookworm eggs present to float to the top, making them visible and detectable.

However, it's important to note that this test is effective only once the hookworms have matured and started laying eggs. Unlike some other types of worms, hookworms usually remain attached to the intestinal lining and are not visible in your dog's feces until the infection is treated.

It typically takes around 2-3 weeks for the hookworms to mature and begin producing eggs. As a result, fecal flotation tests may not accurately diagnose hookworm infections in very young puppies.

How are Dog Hookworms Treated?

A class of drugs called anthelmintics can be used to eliminate hookworms. These medications are typically given orally and rarely produce side effects. That said, these medications are only effective at killing adult hookworms so it will be necessary to repeat treatment 2-3 weeks following the first treatment.

If your dog is suffering from severe anemia due to hookworms, a blood transfusion may be necessary to save your dog's life.

Can Hookworms Infect Humans?

Lying on infected ground can allow the hookworm larvae to begin burrowing into the skin leading to a condition called 'ground itch'.

In some rare cases, hookworm larvae can penetrate and damage internal organs including the eyes, which can cause blindness and complications. Good bathing and hygiene habits can help to prevent hookworm infections in people.

How Can I Prevent My Dog From Attracting Hookworms?

There are a number of key approaches when it comes to preventing the spread of hookworms in dogs:

  • Puppies should be dewormed at approximately 2-3 weeks of age, and if symptoms occur.
  • Nursing female dogs should be dewormed when their puppies are also dewormed.
  • Always clean up after your dog when at the park or out on walks, and keep your yard free of dog waste.
  • Be sure to wash your hands frequently when around your dog, or after cleaning up dog waste. Also, ensure that your children wash their hands frequently.
  • Keep your dog up-to-date on their parasite prevention. Many products formulated to prevent hookworm will also help to prevent hookworm. Speak to your vet to learn more about the right parasite prevention for your canine companion.

Note: The advice provided in this post is intended for informational purposes and does not constitute medical advice regarding pets. For an accurate diagnosis of your pet's condition, please make an appointment with your vet.

If you've noticed signs of hookworm in your pet, contact our Madison vets today.