Actually, dressing up our dogs was a requirement of one obedience school I went to with-my borzoi. I dressed up the female in a wedding dress (not a real one, but plenty of toile, taffeta and lace) and the male in a baseball shirt and cap. (He got off easy.)
The requirement was there because you're supposed to be able to do anything to your dog (humanely) and have the dog tolerate it.
Yes, we passed. Most everyone else just tied bandannas around their dogs' necks.