Everyone benefits when your dog gets a good bit of stimulation each day. I know because i worked at Guide Dogs For The Blind as a Canine Wellness Tech. It was my responsibility each day to get all the dogs out for running, walking, and play while they weren't in class to become a guide. I also worked with all the dogs who didn't pass guide training, and senior retired guides to become adoptable to good homes. I've since moved home to Whidbey Island, but walking dogs and playing fetch with them never gets old or looses its importance. My joy comes from seeing the stress relief and happiness in the dog after its had fun being out for awhile. Everyone deserves a happy dog!