Roundworms (see also toxocariasis) infecting the dog include Toxocara canis and Toxascaris leonina. Signs are usually mild, but may include diarrhea, pot-bellied appearance, poor growth, and vomiting.
It was eerie, spine-tingling, unearthly; it lifted the hair on Harry's scalp and made his heart feel as though it was swelling to twice its normal size.