I’ve mixed feelings about dressing up for dogs for any occassion. However, if the dog likes the attention (and some seem to) and is nicely rewarded then I guess it’s okay.
It also helps if the costume is cool. If you’re a Lord of the Rings fan and know all about those dangerous goblins riding their wargs then this costume will certainly speak to you. It’s not too expensive from NeatoShop either which may just be as well. I suspect a goblin or two might have his head chewed off.