While a general affection towards dogs may be normal in most of the males in your age bracket, please note that any dramatic emotion or longing towards any non-human creature may be a sign of increased sexual compulsivity. If you want to bumure these feelings dont get out of hand, I can introduce you to a relitively new hormone drug treatment. If you are against drug use, then perhaps surgical castration would be the right route for you. If you do not care to suppress such urges, just be sure not to get caught.