We have a 3-year old Staff bitch (quite big for a female, average weight is 15kg, our little mutt's 19.8kg - and no, she's not at all fat!!) who needs no grooming as such, but we bought a brush for about £3 should we need it (she runs away whenever she sees it )
Initial vets consultation (when we brought her home from Dogs Trust) was £20; tablets she needed after her spay operation were about £7; a recent consulation (she has a bit of a skin problem at the moment) was only £17 (not sure why it was cheaper than the first one); tablets (prescriptions) are around £7 I think.
3-monthly Drontal (worm tablets) cost around £7.
Frontline (flea drop pipettes) - go to Medicaid.com for these. Pets At Home (and chemists etc) have 3 pipettes (monthly for 3 months) for around £31; medicaid have 12 pipettes (genuine Frontline), delivered, for just over £40! Bargain - and you don't need prescriptions to get these any more.
The Drontal tablets on medicaid are £4 each - so not cheaper.
Food - she has Pedigree with mixer; 12 x 400g tins (she has one a day, split between two meals - half the can mixed with a good scoop of mixer for each meal) works out around 42p per day, plus the mixer - huge 9kg bag for around £12 which lasts about 6 weeks... can't work that one out but it's not that expensive
She also has Dentistix - one a day - to help with dental hygiene (my niece commented on how white her teeth are and how not-so-stinky her breath is... and she's got 2 Staffs too so it was good comparison IYKWIM). You get a box (depending on weight of dog) with 8 packets of 7 - so 8 weeks worth for just over a tenner; I think that works out to be about 17p each. So for food and Dentistix it's less than £1 a day.
Insurance £9 per month (£60 excess).
You should also consider the cost of dog-baskets, indoor kennels (we have one for bedtime) but they're not essential, toys etc
Exercise is free - long walks and, if our dog's anything to go by, sticks are much preferred to expensive toys!!