Early days yet, my collie Cross is nearly 13 loves to play ball, still jumps to catch it, however, i noticed she was reluctant to jump up onto my bed which is quite high, she's only medium in size. So I immediately put her back on yumove but decided to try Zoomies too. I have to say she's been on Zoomies about a week and the reluctance to jump has diminished. So fingers crossed.