They can migrate into and obstruct the bile duct. An owner may notice a general unthriftiness and poor quality hair coat. With heavy infestations worms may be vomited or passed in the stool. In the majority of pets with ascarid infections no outward signs are apparent. In these cases detection and diagnosis requires a microscopic examination of the feces.
Fecal material is mixed with a concentrated salt solution.
The worm eggs float to the surface of the solution and can be collected for microscopic examination. The appearance of these eggs is specific to the type of worm carried by the host. Once eggs are identified appropriate treatment can be initiated. Human Toxocarosis results from paratenic host second stage larvae somatic migration. In man the migrating larvae develop nodules which occur primarily in the liver, kidneys, brain and lungs.