Purina pro plan veterinary diets canine jm joint mobility is a dry dietetic food for dogs with joint conditions including osteoarthritis you might not notice these conditions initially as they tend to develop slowly however you will notice that your pet is stiff or has started to limp your dog might find it difficult to get up or climb stairs the best way to help your dog stay mobile is to ensure that it gets enough exercise and eats the right food this will help your dog to maintain a heal