Our expert says:
Your reference to your mother sounds like you're not a very old fellow, and horny teenagers at times do the most silly and at times awful things experimentally. Yes, it was silly, and probably unpleasant for the dog.
It might be worth discussing with a shrink or counsellor ( your age and degree of dependency on your parents vs independence might determine how you would arange such access - perhaps through school or college ? ) All shrinks and counsellors are bound to maintain strict confidentiality, by the way.
I don't think you're going to hell. Your current alarm and panic is the hell, and you're there already, and I'd think ready to return from there.
I agree with ami that the guilt you feel shows that you recognize how wrong this was, so your basic sense of right and wrong is intact, though it was temporarily over-ridden by a spasm of lust.
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