My dog-child Buddy loves to take me for a walk and we both enjoy the exercise. Buddy loves tennis balls and they can be quite expensive to buy all the time, so being the frugal dog that Buddy can be, we walk to the local park alot. He loves it, as he usually always finds a tennis ball or two! He is truly the frugal dog, we haven't had to buy tennis balls in months and he is always so proud of his frugal find!