I never really found a need to use the bank or advertising. I was swarmed with patients every day - and money came in at a steady clip. The key is to of course treat each patient properly. If you do, you'll be paid and your patients will return often. Just what kind of pet owners are these, if their pets get sick every day?

Flyer - 1000, goes out for 3 days
Newspaper - 2000, lasts for 1 week
TV - 3000, lasts for 2 weeks

Pet Vet Walkthrough

Paws and Claws - Pet Vet Review