I have a 10 yr old boxer. I put a very small amount of borax in "our" bottled drinking water (He got sick from tap water $177 vet bill). Cheaper to give him bottled water. After 3 months he and I are doing better. So there you have it from two old bachelors. Parts are starting to work better. We don't look at the stairs and then look at each other, we just climb them.