Exactly what others have said, if it will improve their quality of life you spend it if you can. If it is just to prolong a miserable experience, do them a favor and let nature take it's course.
We have a fifteen year old pound puppy mutt. Five years ago we moved into our first house after he had been couped up in apartments his whole life. Our first week in the house he blew out his knee running around the yard. We spent $1,200 to have it reapaired. It was worth it though as he is the most active fifteen year old dog I have ever seen and our two and a half year old daughter loves plaing with him. Now that he's fifteen, is beyond his life expectancy, and is having hearing and vision problems, we would have to think hard before spending that much money again.
We have a fifteen year old pound puppy mutt. Five years ago we moved into our first house after he had been couped up in apartments his whole life. Our first week in the house he blew out his knee running around the yard. We spent $1,200 to have it reapaired. It was worth it though as he is the most active fifteen year old dog I have ever seen and our two and a half year old daughter loves plaing with him. Now that he's fifteen, is beyond his life expectancy, and is having hearing and vision problems, we would have to think hard before spending that much money again.