The dog onesie is fashionable and functional. Dog onesies can help protect your pet's skin and fur from dirt, allergens, or irritants, making them especially useful for dogs with sensitive skin or allergies. They can also provide a sense of security and comfort, similar to a swaddle or snug-fitting garment, which may help soothe anxious or nervous dogs. Also it can help you keep your house, car and clothes free from dog hair.