Is it sick for my friend to be turned on by watching dogs mate?

It's not uncommon for people to have varied reactions to animal behavior, including mating. However, being turned on by watching animals mate could raise ethical concerns regarding the objectification of animals or inappropriate associations with sexual behavior. It's important for your friend to reflect on why they feel that way and consider the implications of their feelings. Open communication can help clarify any misunderstandings or discomfort around the subject.