Roundworms in Dogs

Ascariasis is an intestinal infection caused by a parasitic roundworm.  Roundworms are typically quite large, measuring upto 18cm (7 inches) in  length and are found in large numbers. When a dog's body becomes infected with roundworms, they can cause abdominal swelling (distention), colic, gastrointestinal issues and even intestinal rupture.

There are two species that commonly infect dogs: Toxocara canis and Toxascaris leonina. Adult roundworms live in the stomach and intestines and can grow to 7 inches (18 cm) long. A female may lay 200,000 eggs in a day. The eggs are protected by a hard shell. They are extremely hardy and can live for months or years in the soil.

Common symptoms of ascariasis are:




Abdominal swelling

Abnormal feces

Poor nursing (in females)


Coughing (caused when the roundworm larvae have migrated into the dog's lungs)

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