Quite a lot. just a few quick points are: insurance, vet fees, medications like antibiotics (occasional), worming tabs, flea control (regular), bedding, crates, toys, leads/collars, food/kibble, aswell was stimulation, exercise, training, training classes/socialisation
I was payinf £650 a year for insurance until i reviewed and got it for £350 - vet fees £30 a visit, treatments £60-80 a visit
In all anual costs are probably around £800+
I have a springer btw