It is inevitable when you take in the old and sick I suppose... I lost 6 rescue dogs in the last 7 years. My tripaw never really got over my husband's death 2 years ago and I had to let him go last summer and knew that his best friend would probably not survive the next winter. Sadly I was right and had to have him pts last week.
Which leaves me now with another oldie who is likely the next to go and a young hooligan who really is going to struggle with being an only dog. He turned out to be much younger than we had been told when we adopted him but we couldn't hold that against him so he stayed. I hope that when the time comes he will adjust (luckily I work from home so hardly ever have to leave him), otherwise I might have to adopt again which I don't really want to do.