For all you non-vegetarians out there, why is it good to eat some animals and not good to eat others?

I grew up near a farm as a kid. I would hang with some pigs and cows. They were fun and kind animals. But, they were eaten. Now, I sometimes can’t sleep cause these punk pit bulls on the block keep yapping. Seems to me that they would be finer on someone’s dinner plate than some good ol’ sweet pigs and cows. Something seems wrong with this picture.