My son walks into the kitchen and say's to me, "I feel bad." I said to him, "Do you have a fever, does your tummy ache?" "What do you think is wrong?" He said, "Don't YOU FEEL BAD when YOU sin?" I said, "Yes, I feel terrible when I sin, but I know how to fix it, you can go to confession and say you're sorry and then you can forget about it."
I didn't ask him what he had done, I figure it's between him and God, though I'm pretty sure the dog knows. People like my son who have a sense of right and wrong may not do very well in this world, but they'll do just fine in the next.