I don't have any pets myself (yet ?). My uncle (who lives on a farm) has a dog, an onn his current dog he spent as much on vet-bills in 6 months as he did on his previous dog who ended up being almost 15 years old (for a German sheppard). The dog is now on a special diet, so my guess is he has spent as much or more(dog is roughly 6 years old) then on his previous dog. Still, once you have chosen for a pet, he deserves the best.
In my previous shared house our housecat was killed (either dog or mauled by the neighborhood bullies) the day we left the house (as it was sold).