The worst to me is when someone dumps an animal at a shelter whom they got as a young animal and have had for years - because of moving, new baby, whatever. So now there's an older animal (less adoptable), who is no doubt experiencing terrible confusion and fear at being separated from his or her family, and may die at the shelter. The least they could do is try to find a new home themselves, check in on the animal, insist that the animal be returned if things don't work out, etc. But so often it's just dump the animal and move on. I had a "friend" who did this when she had a baby. She's no longer a friend - I found it unconscionable.
"If you want to know where you would have stood on slavery before the civil war, don't look at where you stand on slavery today, look at where you stand on animal rights." - Paul Watson.
Every animal you eat
was running for her life