I know that feeling !, aren't we lucky that the vets allow drip feeding payments. Not many industries would. I have a DD set up so I pay every month regardless of what is happening. It is a very rare moment to be in credit !
It's a lovely feeling..I paid off over a thousand last month, £650 this month to pay, plus I'm estimating £200-300 next month. I pay off in full as don't like having debt (other than student loan and a one day mortgage!).
It's not such a lovely feeling that my savings that I worked hard to save, that were supposed to allow for a summer off after graduating are going down at an alarming rate and I'm having to job hunt already :'(
Oh god yes I am going to be paying off quite a lot over the next few months or so. Luckly my vet do let you pay in instalments, min of 10% per month, However I always do as much as I can comfortable get away with, don't like being in debt!