Character: dukey

Dukeson "Dukey" Test is Johnny Test's pet dog and the deuteragonist of his eponymous show. Johnny got him as a birthday gift for his 11th birthday and he was later mutated by Susan and Mary, giving him the ability to speak and walk on two legs. His is a mutt of completely indistinct breed with with brown fur.

He is the voice of reason in many episodes, but often winds up joining in Johnny's crazy schemes and adventures (usually because of steak or Johnny tempting him into it). Despite his devotion to Johnny, Dukey frequently expresses deep disdain towards Johnny's less intelligent antics, believing their situation as master and pet are reversed. he usually gets more stressful than his master in dangerous situations, and often gets worried whenever there's a rather risky Test for Johnny from his sisters.

He was voiced by Trevor Devall but was later replaced by Louis Chirillo.