My 12 mo old son has learned that our dog makes a strange sound so he copies her. "Ooof." So when he sees Missy (dog), he says "ooof." Well.......my husband told me this morning a cute story about when he took Joshua down to see Gram and Pop the other day (while I was at work). He has a little rocky horse down there. They said "you wanna see rocky horse?" He looks at the horse and goes "Ooof!"