Though some breeders claim they are a hypoallergenic dog breed, there is no scientific evidence to support the claim that hypoallergenic dog breeds exist. Their non-shedding qualities have made them more popular in recent years. Because they are working dogs, PWDs are generally content in being at their master's side, awaiting directions, and, if they are trained, they are willing and able to follow complex commands. They also make unusually good therapy dogs. A PWD usually stays in proximity to its owners, both indoors and outdoors. Some speculate that this intense bonding arose in the breed because the dogs were selected to work in proximity to their masters on small fishing boats, unlike other working dogs such as herding dogs and water dogs that range out to perform tasks. In any case, the modern PWD, whether employed on a boat or kept as a pet or a working dog, loves water and attention and prefers to be engaged in activity within sight of a human partner.