They aren’t. They’re considered to be affable goofballs, like Mr. Peanutbutter.

Look I don’t wanna spend too long breaking this down but there’s a reason Air Bud is a Golden Retriever and not a cute lil Dachshund.

big? well they’re not small, i’ll give this part a pass
strong? on account of not being small they’re also not weak, but on the scale of dogs no they’re not strong
masculine? yes, the good kind