A Doberman.
Their knees. (Not sure if this one translates well to english)
You look quite put-together this evening.
Because his lawyers keep filing away his briefs.
People sometimes get upset if you shoot a duck. The duck is much less greasy. BUT MOST IMPORTANT Nobody ever complains about a duck's bill.
A Doberman fincher!
Because they wag their tails whenever they have a good hand. Why did John's dog win the poker tournament Because he's a Doberman.