Aging 4 legged friends

Glucosamine. I take two a day and the dog gets one. Bear is a bullmastiff and rottweiler mix. 105 lbs. Walgreens has the formula just for dogs but it's the same 1500 mg that I have been taking. The vet said it was the same thing, so................... We've been splitting a large bottle about every two months. It's made a huge improvement in both of us :)