The first type is pigment associated and is found in border collie puppies, although the puppies can have congenital sensorineural deafness from birth as well. The second type is known as adult-onset hearing loss. Dogs registered with either working or confirmation based registries are seen in other performance events such as agility, obedience, tracking or flyball; however, these dogs do not necessarily conform to the breed standard of appearance as closely as the dogs shown in the breed rings as this is not a requirement in performance events, nor do they necessarily participate in herding activities.