Most of the costumes listed are made of cotton or polyester materials. They are fairly safe on the dog, even if he or she tears it and begins to eat it. There are not many small parts on these, and for the ones that do, they are not very harmful. Designs like the full-bodied Stegosaurus has plates on the spine that could be chewed off, but they are made of foam material. the best thing is to decide whether to leave the animal alone or not based on the temperament. If your pup is known to be destructive, then it may be best not to leave them alone with the costume. Just like children supervision may be necessary at all times to protect your investment and the dog’s health.