A Derp
A dog that looks like it was hit by a bus and then cried in a puddle. It's got big eyes, a face like a pancake, and a brain that's barely working.
That pug is a Derp. It looks like it was born in a trash can.
My neighbor's dog is a Derp. It coughs like it's dying.
That French bulldog is a Derp. It has the face of a confused potato.