I want to get a dog.

I could probably qualify for a service dog, but if not I would get one from a shelter/rescue.

My question is: How much does taking care of one actually cost? I've done some Googling and answers seem to vary. I'm asking here because I'm interested in your personal experiences.

EDIT (7PM PST): Thank you for your replies!

I think I'm going to try and volunteer at a shelter so I can just hang out with dogs instead, heh.