How Can I Tell Which Type of Worm my Dog Has?

Posted on 25 Feb 2026 | Posted in Petcyclopedia

Do you suspect that your dog has worms? Before you spend your money on deworming pet meds, you first need to know what kind of worm infection you are treating. In this blog, we look at the five most common types of parasitic worms that infect dogs, as well as discussing which pet meds are the right treatment for each one.

Roundworm Symptoms and Pet Meds

Roundworms are one of the most frequently encountered worms in dogs. Puppies often have roundworms, as the worms are transferred from the mother to her young. Adult dogs may catch these worms if they come into contact with contaminated environments.

If you think that your dog has roundworms, the symptoms to look for include weight loss, general lack of condition, swelling in the abdomen, vomiting, and diarrhoea. In many cases, roundworms can be seen in the vomit or faeces of an infested dog. They are white, string-like, and can grow to several inches in length.

If your dog has roundworms, you should choose pet meds specifically formulated to eliminate this type of parasite.

Heartworm Symptoms and Pet Meds

Heartworm is a growing threat for dogs and has been identified throughout the United States. Spread by mosquito bites, heartworm symptoms include coughing, respiratory difficulties, a swollen abdomen, dull coat, and lethargy.

If you are concerned that your pet has any of these symptoms, you should see a vet immediately. Heartworm infection is serious and requires pet meds supplied by a veterinarian, as treatment may be ongoing.

It is important to note that the best treatment for heartworm is prevention. Consider using preventative pet meds such as selamectin to protect your pet.

Tapeworm Symptoms and Pet Meds

There are several types of tapeworm that can infect dogs. Carriers include fleas, raw meat, rodents, and contaminated soil.

Symptoms of tapeworm vary, with the most obvious being visible pieces of tapeworm segments in the animal's faeces and irritation around the anus. Tapeworm infestation can also cause abdominal pain, vomiting, and loss of condition.

If your dog has tapeworm, treatment with a pet med containing praziquantel will usually be rapid and effective.

Whipworm Symptoms and Pet Meds

Whipworm is a parasite of particular concern to dog owners because it can potentially be transferred to humans. Dogs become infected with whipworms through contact with contaminated soil or other infected dogs.

Unlike some other types of worms, whipworm symptoms can be harder to identify. They may include flatulence, blood in the faeces, diarrhoea, and weight loss.

If you suspect that your dog has whipworms, you will need to see a vet for confirmation via stool sample testing and to receive the appropriate pet meds.

Hookworm Symptoms and Pet Meds

Hookworms are most common in adult dogs and can be passed to humans through skin contact.

These worms cause bleeding in a dog's intestines, which can lead to anaemia (often identified by pale gums) and weight loss. Other symptoms include blood in the faeces, lethargy, and skin irritation.

If you think that your dog is showing signs of hookworm infestation, you should seek treatment from your veterinarian as soon as possible.