Worms in Dogs: Types, Symptoms & Prevention

Worms in Dogs: Types, Symptoms & Prevention

Worms in dogs are an unpleasant reality for many pet parents. While the thought of parasites living inside your beloved pup is unsettling, understanding how intestinal worms develop, how to spot the signs, and how to prevent them is a vital part of responsible dog ownership. Left untreated, some types of worms can lead to serious health complications, especially in puppies.

What Are the Symptoms of Worms in Dogs?

Because most intestinal worms are microscopic, you won’t usually see them in your dog’s stool, except in the case of tapeworms. Instead, symptoms may include:

  • Diarrhoea

  • Vomiting

  • Swollen, painful, or pot-bellied abdomen

  • Dehydration

  • Lethargy

  • Coughing (commonly linked to roundworms, hookworms, and in rare UK cases, heartworms)

  • Nutritional deficiencies

  • Blood in stool

  • Weight loss

  • Poor coat condition

  • Scooting (dragging their bottom along the floor)

  • Pneumonia (in severe cases)

  • Intestinal blockage (in severe cases)

If you notice any combination of these symptoms, consult your vet promptly.

What Causes Worms in Dogs?

Dogs can contract worms in several ways, which is why routine preventative care is so important.

1. From Their Mother

Roundworms and hookworms can pass from mother to puppy during pregnancy or through milk while nursing.

2. Fleas

Certain fleas carry tapeworm eggs. If your dog ingests an infected flea while grooming, they may develop tapeworms.

3. Contaminated Soil

Roundworms, hookworms, and whipworms lay eggs that are passed in faeces. These eggs can survive in soil for years. Dogs often ingest them while grooming dirt off their fur or sniffing contaminated ground.

4. Eating Infected Animals

Dead rodents, rabbits, and other wildlife can carry worm larvae. Dogs that scavenge or eat raw, contaminated meat are at higher risk.

5. Mosquito Bites

Mosquitoes can transmit heartworms. While heartworm disease is not currently common in the UK, dogs travelling abroad may be at risk.

Common Types of Worms in Dogs

Hookworms

Hookworms are small, blood-feeding parasites that attach to the intestinal lining. They can cause anaemia, particularly in puppies, and may be fatal if untreated. These parasites can migrate through different parts of the body before settling in the intestine.

Tapeworms

Tapeworms live in the lower intestine, attaching to the intestinal wall and absorbing nutrients. They are flat and segmented, sometimes growing over half a foot long. You may notice small rice-like segments in your dog’s stool or around their rear end. Scooting is also a common sign.

Roundworms

Roundworms are among the most common intestinal parasites in dogs, especially puppies. Often transmitted before birth, they resemble long strands of spaghetti and can interfere with growth and organ development if untreated.

Heartworms (Not Currently Present in the UK)

Heartworms are one of the most dangerous, yet preventable, parasitic infections. Transmitted by mosquitoes, they grow and multiply within the heart and lungs, potentially leading to heart failure. Symptoms may include:

  • Exercise intolerance

  • Weak pulse

  • Pale gums

  • Laboured breathing

Treatment is lengthy, costly, and requires strict rest, making prevention especially important for dogs that travel abroad.

Whipworms

Whipworms live in the large intestine. They typically cause fewer nutrient deficiencies but can result in bloody stools when infections are severe. Though less dangerous than some other worms, they still require treatment.

How Are Intestinal Worms Treated?

If you suspect your dog has worms, your vet will likely request a stool sample to confirm the diagnosis. In some cases, blood tests may also be necessary. Once identified, your vet will prescribe a targeted deworming treatment.

If your dog is pregnant, consult your vet about safe worming protocols. Some veterinarians recommend daily treatment with fenbendazole from day 40 of pregnancy until shortly after birth to reduce transmission to puppies.

Bringing a stool sample to annual check-ups, even if not requested, can also help your vet monitor your dog’s digestive health.


How Can You Prevent Worms in Dogs?

Prevention is far easier, and safer, than treatment. Key preventative measures include:

  • Regular deworming treatments (tablets, spot-ons, or injections as advised by your vet)

  • Consistent flea prevention

  • Prompt removal of dog faeces

  • Avoiding raw or contaminated meat

  • Discouraging scavenging during walks

  • Preventative heartworm medication for dogs travelling abroad

Routine parasite control protects not only your dog but also your household and local community.

Can Humans Catch Worms From Dogs?

Although uncommon, humans can contract certain worms from dogs, including roundworms, hookworms, and whipworms. In rare cases, tapeworm transmission has also been reported.

In most instances, infections resolve naturally, but symptoms such as headaches, fever, stomach pain, or coughing can occur.

To reduce risk:

  • Maintain a regular worming schedule for your dog

  • Practise good hand hygiene

  • Wash hands before eating and after handling pets

  • Clean communal towels and bedding regularly

If you own both cats and dogs, remember that parasites can spread between them, so ensure all pets in your household receive appropriate preventative care.

Final Thoughts

Worms are a common but manageable part of dog ownership. With routine preventative care, regular vet check-ups, and good hygiene practices, you can protect your dog from discomfort and serious health issues. When in doubt, always consult your vet, early intervention makes all the difference in keeping your pup happy and healthy.

 

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