Toxocara canis (also known as
dog roundworm) is worldwide-distributed helminth parasite of dogs and other canids.
Toxocara canis is gonochoristic, adult worms measure from 9 to 18 cm, are yellow-white in color, and occur in the intestine of the definitive host. In adult dogs, the infection is usually asymptomatic. By contrast, massive infection with
Toxocara canis can be fatal in puppies.
(Wikipedia)