Haha, threads like this make me think maybe being single isn't so bad after all. The girl crashes her car, her dog dies, it's her birthday tomorrow, and now some poor bastard is about to get used as a punching bag for all of this drama he didn't cause, and he doesn't even know it.
Seriously though, phone your bloody boyfriend and tell him you need him around today. Unless he actually said the words "Your dog died? Ha! I don't care! I always hated that dog, and in fact I hate you too!" , chances are he actually does care (about you, not the dog). You're not really angry with him anyway, it's just a grief coping thing.
It's your birthday tomorrow, and you have a mother****ing boyfriend. Life's not so bad. Sorry about your dog, though.