TTucker~ I just came on the this section of tpf because we are thinking of adopting another dog, one we found on Petfinders also. Your story is very touching and I couldn't stop reading this thread. I had to treat my "pound puppy" for heartworms too after I adopted her. She thankfully made it through OK, but she was less than a year old then. I'm sure it's much harder on a dog Sam's age. But you were truly his angel and he was able to spend his last months with alot of love and affection!!! It takes alot of strength to give that selflessly to another, as you did with Sam. You are truly an inspiration! Hugs to you!