Insurance i dont have but wish I did as my dog broke her leg and cost us £1k to get fixed so I recommend insurance. few quid a month I thinhk.
Food is cheap enough I get tesco brand and whatever is on offer like £3 a week she dosnt eat dried stuff hates it.
grooming that you can do yourself, most groomers here wont take large dogs so we have to do ours.
Vaccoinations I cant remember it was that long ago but one off payments.
It dosnt cost that much to keep a dog alive but when something goes wrong they are walking vet bills. Depending on what breed you get also.
I have 2 cats to, cheap enough,.