You asked why people are against it. May I ask why are you for it?

I no longer have a dog, but if we did, I wouldn't dye it. What purpose would that serve?
I personally just think it looks cute. It doesn't hurt them they don't notice so I don't see why people would think it's cruel. It's not like a hair cut where your dog feels the hair gone it's like a bath and they get more attention after.

I don't do it to use my dog as a accessory (sp?) but not many people have seen a pink dog so it does get her more socialization which is so good for her cause she's so shy.