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.

，又称弓首线，是由犬弓首狮引起。症状通常比较温，但也可能包括腹泻、腹部胀大、发育迟缓呕吐。