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Not only do coats and sweaters on dogs look incredibly ridiculous, they serve no real purpose, since dogs can't catch the cold virus and in most cases they don't even notice when it's freezing outside. Even worse: Dressing up your dog can be downright "dangerous," say vets, since it interferes with how they regulate body heat, and that can lead to heatstroke. "If New Yorkers want to make a fashion statement, they can do it with a colored collar," says one vet. [NYP]