A Doggy's dewclaw could be the 5 digits in its forelimb and hind legs. Dewclaws over the forelimbs are attached by bone and ligament, whilst the dewclaws to the hind legs are hooked up only by pores and skin. Most dogs are not born with dewclaws of their hind legs, https://helixplanet.com/essential-dog-breeding-supplies-progesterone-testing-for-dogs-puppy-incubators-and-more/