Man TJ sorry to hear about your hound. 15 is a long run for a Lab, they have huge hearts and will simply go and go. I raised my kids with one and buried her underneath a swing set daughter and I welded up out of drill pipe and scrap stainless. I had to stop digging over and over to empty my sun glasses. She would lay there for hours and watch over the kids while they played. All of our children are raising their kids now with the help of a fearless hound of some kind. Hemi my constant companion German Shepard turned six on Christmas Day. I am not man enough to even take her to the vet, the wife has to. I can’t bear to watch her suffer in any way. Be strong doing what you need to do. I have had to do it on several occasion and each time I swear to myself I will never get another dog so that I do not have to repeat. Next thing ya know I have fur ball of some kind in my lap!