My wife and I rescued a redbone coonhound when on vacation in Florida. His owner had died and he had been abandoned and running around free on a large adventure type resort property for more than 2 years. The property owners had arranged for his capture and euthenization the day after we were due to leave for the drive back to Michigan.
So needless to say, he came back with us on a 1000+ mile road trip and when we got back home I set up a dog run for him with an overhead wire between 2 trees and built him a nice doghouse. Well, the neighbors fell in love with the dog and were kidnapping him at every opportunity they could get. We went away for a week long vacation to Colorado and while we were away, he apparently took to crawling UNDER his dog house (which I raised about 16" off the ground for snow clearance). Somewhere along the line, he succeeded in injuring one of his knees. Initially we didn't know what was up, and chased a few other minor injuries and scrapes, but his symptoms got worse and worse till he was no longer getting up and obviously in constant pain.
That was about when the knee problem was properly identified and the prospect of surgery was raised and the vets were clear that if 1 knee was failing, you could expect the second to not be that far behind. There was no way we could afford the procedure, but my neighbors had grown very attached to the dog and they felt that if it was their dog, they would be willing to cover the surgery if it was ultimately needed. So that was how the neighbors adopted the dog. They got him some pain and anti inflammation medication and because their house is all on 1 level, were able to avoid some of the daily injury potential associated with stairs up and down, which is the case with my house. After a few months rest, his knee healed without surgery to the point where he was as happy as a clam.
With the knee healed, they turned their attention to any other medical issues and discovered that he was infected with heartworm from his time as a free ranging dog after he had been abandoned. After some discussion with their vet, they decided to try a new treatment for heartworm that was supposedly less toxic than the regular stuff. It gets administered in 3 visits, each time with a substantial increase in dosage compared to the previous visit. Unfortunately, he died after being given the second round of treatment at a cost of nearly $2000. Prior to being treated he had no outward symptoms of ill health.
So its a sad story. We couldnt have given him the knee surgery if it had come to that. As it turned out, despite all predictions to the contrary, his leg healed without surgery, with just the re-arrangement of his living arrangements so as to avoid stairs while he healed. Finally, he was then killed by a treatment that he didnt absolutely need and without which he might have lived another 4-5 years in fine health. So, my caution to anyone in this situation is that sometimes, less is more.
Picture below taken the night before he died, he "escaped" from the neighbors and paid us a visit at 1am. You can see his pet fence collar is still on ... The next afternoon he passed at the vets office.