My Son’s 11 year old tabby cat Toby was over weight, moving slow and couldn’t haul him self up on my son’s bed with out pulling him self up with his front legs. When he tried to get up from  laying on the floor, his back legs did not easily negotiate the getting up because of Arthritis. My son gave Toby a tea spoon of Nopalea  with his food for 3 days and Toby started to react by getting up easier. Now Toby  gets on the bed like he owns it and has  more energy and has lost some of his weight. He may feel like he is a fat cat but he no longer looks like one.He loves Nopalea on his tuna. Terry