@ComicDom1:
A lot of very good comments here. I would like to add and point out that I really do not think a dog understands what kind of costume they are put in whether its mean to be funny or scary. So if its a human that is deciding the purpose of the costume or what it that costume should reflect, I still maintain its a human choice and/or projection onto an animal that normally would not choose it.
I don't dress my dogs in costumes for Halloween. (I don't really like Halloween.) But I do put Hal'n bandanas on the dogs. I'm not sure what the difference is. Da boyz are certified therapy dogs, and if we visited a place where children were, I'd get costumes for them, but don't feel inclined to do that for adults. I do think that putting on a bandana or some holiday item helps relate to the adults and may especially help with the Alzheimers people. (We do visits to an Alz facility.)
I was talking to someone (may have been an AKC rep) and she was getting geared up to train her rott to do therapy work. The first thing out of my mouth was put something silly on the dog and teach her a silly dog-and-pony trick. If I had a "bad" dog breed, or even a big black dog, you bet I'd put a silly, frilly collar on it to do therarpy visits. It softens the image of the breed and makes the dog and you more approachable. And I think it's very important for people of those breeds to go the extra mile to make their dog look friendly and have people in society have a good impression of these dogs.
There have been several people saying that the dogs don't enjoy being dressed up. That's true, but some dogs do. They realize they get extra attention when they are dressed up and really do seem to enjoy it. My mom's papillon seems to enjoy her frilly collars and many poodles love stuff like that. My basenjis don't really care much but they don't like hats; Zest was fine with panties on during the season; they don't mind the coats on cold days; they leave the bandanas alone.
Is all that "humanization" of dogs? I don't know. Is it a human choice that the dog would not choose? yea, but so are a lot of things. Any breeders care to tell the story of putting a collar on for the first time? I know my dogs would not choose to be in crates in the car or in the house. I also know they'd choose not to be on leash, skip the vet visit, etc. There are a lot of choices I make for my dogs, but the fact is that they in a human society. I know some people who would say keeping a dog inside is too much.<shrug>
I do agility with my basenjis. That is a "humanized type of control" (even off leash) but they do seem to enjoy it. Would they choose to do it without any training? Zest certainly did the dogwalk and Aframe, but not the teeter, jumps or weave poles without training, but she seems to enjoy herself when I put my criteria on the game. She enjoys the learning.
Is "humanization" a bad thing? I don't know. We all seem pretty happy and well adjusted in my house.</shrug>