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Movie from around 2003 or so (definitely after 2000 before 2006).
This fat guy has his GF leave him, then goes driving around at night and hits a dog supposedly killing it but the dog comes back and starts talking to the guy, gives him some good ideas for his job (I think he is an artist or comic or something)
It's clear this guy is out of his mind and he tries to get another girlfriend but some broads end up getting killed and then some necrophilia situations take place. Before and after he buries them in his backyard.
I know the movie was named after the dog's name