I have a 14 year old lab that's just going down. Since the loss of my 15 year old lab in July 2015 he hasn't been the same. He gets around but not the best, he can't hold his poop, he eats, drinks, and loves to be loved on. He cannot hear, can see some, and recently over the week sometime it seems to be hard to breath. Gasping some, with a wheeze. It's going to be tuff on me personally to put him down. I thought around on my 15 year old and then came home one day and she passed. That's was tough. Now it's that time again. When does one know that it's best to do it?