Crude farmer/sheep joke

Sorry if some of you find this crude but I couldn`t help but laugh at this one:

A farmer walks into his bedroom with a sheep under his arm "Honey, this pig is what I f*ck when you don`t feel well". The wife looks up from the magazine she`s reading and says, "That`s not a pig, it`s a sheep." The man replies, "I was talking to the sheep."