You can get things like hip replacements for dogs now, but it isn't cheap. We had a knee replacement for our rottweiler that cost about $10K all up, but he was only 4 when it happened, had he been 8 we probably wouldn't have paid.
List of problems: suffered from Panosteitis until she was 2, tore ACL when 1.5 years old, had eye entropy surgery. The toughest was the ACL. Shes 7 now, suffers from pretty terrible arthritis which I combat with different stuff.
Tomorrow, my brother is taking his doberman shipped to the US from Serbia 3 hours away to the doggie dentist, where he has the most fucked up teeth you have ever seen. They are made of glass. My brother is already in over 7g's on the teeth, the dog is about to turn 2...
Anyways, you are a great human being and I am glad rottys are getting love like that.
I can't say we would have done the same for most other dogs we've had, but this one was special and we got another 8 years out of him.