ageing dog

My dog (small dog) is very old (about 15) and has gradually started to deteriorate as you would sadly expect, noticeably more recently, although he is still fit for his age. I’m just wondering if I should be feeding him supplements? What do other owners of elderly dogs do? He has quite a weak...

As I get older, I'm finding that what I eat and the amount of exercise I need are changing. I wonder if it's the same for my dog? He's getting on too, but doesn't show any signs of slowing down but I don't want to let him 'overdo' things and so I thought I'd see what other owners' experiences are.