Sorry to hear man. My first dog lived from when I was 2-19 years old. We put her down at 17 and it was stupid hard for me to handle, but a new dog and time helped. We waited way too long because she was very bad by the time the day came. She actually wondered off to die the morning we had vet come out to put her down to stop the suffering. She barely could move and was bleeding out of some places while flies were feeding off of her. The sight fucked me up because she was looking at me breathing hard with tongue hanging out. I guess I'm saying if it's bad, don't wait too long because the suffering gets worse fast.