My 12-year old boy has had hip problems lately, more difficulty getting up and walking slower, I've been giving him joint supplements most of his life. Today he stopped getting up. I tried to help him but he growls and cries at the same time and falls back down. I'll take him to the vet as soon as I can, but what's the usual outcome of this? It's most likely arthritis. I've heard there is very expensive medicine to keep him walking. How many do the medicine, how much, on average, does it cost, and how long does it prolong their ability to walk? He's otherwise healthy, is this the end? Do some put their dogs to sleep once they can't walk? He's 130 lbs, it's going to be hard to have him go pee tonight....any advice would be appreciated, thanks.