We have a large Choc Lab who suffers from arthritis in his rear joints. He has been on Recovery SA for years but It is apparently not stocked any more. I checked with the manufacturer and they advised that Recovery EQ is the same but has an extra ingredient that will not harm the dog. we are now on the 3rd. container of EQ and it appears to work just as well. He is virtually pain free and doesn't know he is getting old.