Rin Tin Tin

A dog who likes to attempt to do lewd things to his owner but very often gets shut down. He is a horny mutt who constantly pests his owner and shows his love towards her in his own way. [Spoiler] At one point he realises that he has an archenemy, the UB (Ugly Bastard) Teacher and this turns into a showdown between men, battling for the girl. [/Spoiler]