How much does it cost to keep a small dog in Oregon?

I live in Oregon, and I want to get a small or small-medium sized dog, but I have to come up with first time, monthly and yearly costs so I can show my parents that I can pay for it (once i know the amounts I am getting a job that will pay for it). I have been researching how much it costs and came up with some ideas but i want to make sure its accurate and I'm not leaving anything out. Food might be less if I get a small dog but I planned for a small medium dog since i don't know what I'm getting. I didn't include grooming because i plan to get a short-haired dog, but if I get a long haired dog i will get a brush and i'm sure my mom would clip him/her when neeeded(she cuts hair) I plan to get a small dog from a rescue or shelter so the dog will have current vaccinations and spayed/neutered. Here is what i have so far:

First time: Dog(around 200), bed(20), toys(20), treats(5), food-Chicken Soup brand-35 lb(35), flea treats(13.95), collar/leash(20), heartguard-year supply(48), ID tag(5), doggie coat(15). I already have food/water dishes. some of this stuff you could get cheaper, but i want to get quality supplies so i don't have to spend as much money replacing it.

Total for all that was about $377.

Here is what I have for monthly costs, this is not money that is neccessarily always spent but that is set aside.

bed(.5), toys (1.67)treats (1.67), Food(11.7), flea treats(4), Heartguard(4), vaccines(5), vet bills(25). Total for all that is $53.54

Now for yearly...

bed(6), toys(20), Food(140), treats(20), Flea treats(48), vaccines/checkup(60), heartguard(48), vet bills(300), bowls(1).

Total is $643 per year.

I set aside 300 for vet bills but i might not use it all, its just an emergency savings that will build up and if in 5 years something happens I will have $1,500 to pay for it. is there anything I'm missing, or that costs more than what i put down? Any input on this is would be very helpful!!!