I don't think there's anything strange about believing in ghosts. But, if you don't like the dog, you don't like the dog. Why force it? I mean, if you were being mean to her, or abusing her or neglecting her, that would be different. But, as long as you take care of whatever responsibility your mother has placed on you as far as the care of the dog, then, that's the best you can do, IMO. That sucks that you don't dig her.