I have a 12 year old (almost 13) dog with arthritis and a hip problem (I'm thinking hip Displaysia?). When she was a pup to when she was about 7 she was pretty active, but since then she's been a lazy lump on a log. I don't want her to become overweight or any thing. Is there a way to exercise her 'softly'? Her joints mess with her even after a little walk around the yard.