**1. Introduction**

Toxocariosis is a neglected zoonotic disease transmitted from dogs and cats to humans. This is mainly caused by the presence and action of the nematode *Toxocara canis* (*T. canis*) and less frequently by *Toxocara cati* (*T. cati* syn. *T. mystax*). *T. canis* uses canines, mainly puppies, as its definitive host, and *T. cati* uses kittens. In addition, they use a wide variety of paratenic hosts, including pigs, sheep, rabbits, rats, mice, other mammals, chickens, and other birds. In humans, the infection is accidental, and the parasite behaves similarly as it does in paratenic hosts. Some invertebrates, such as earthworms and cockroaches, can also have *Toxocara* larvae in their tissues or their gut [1, 2].

Adult *T. canis* worms live in the small intestine of puppies. The females measure from 10 to 18 cm, and the males measured from 4 to 10 cm. At the anterior end, they have three small lips that do not protrude beyond the diameter of the body.

A dentigerous border can be seen on the inner surface of each lip. Behind the lips are a pair of cervical fins that give the anterior end of the worm an arrowhead appearance. The posterior end in males ends coiled toward the ventral part and has a terminal narrowing in the form of an appendix, and a pair of small and symmetrical spicules (0.75–0.95 mm) are observed. In females, the vulva is located approximately in the middle of the body, and the posterior end ends at a straight, blunt point. *T. cati* adults are very similar to *T. canis*; the cervical fins are broader and convex, giving the anterior end a more marked arrowheaded appearance; males are 3–6 cm long, and females are 4–10 cm long [3].
