worst pet thing I did was test cat dynamics when small... ie does it always land on its feet(tried varying directions, etc). I don't think I'm alone on that as my ex husband did same but put tape on their foot bads and my roommate found end over end they don't land on their feet(and rise a tad disoriented)...

Actually no wait maybe the worst was when I trimmed the cats wiskers(well my dad shaved why not the cat...) or when I gave the dog a haircut(it was a cockapoo thing and I thought I was doing a good deed and saving my parents grooming costs)... Mind you I was a little kid and ment no harm at the time... unlike someone else I knows kids that either found it funny or who knows what whent through their mind when they had some fun with their dog. My brother tho deliberately did something nasty to a dog once. It kept going into our yard, making a mess, etc so he took out his bb gun and shot it in its privates... the dog was ok but never did mess/do things in our yard again.

The worst thing I think I've ever had done to some of my pets was when I had pet chickens as a preteen. This kid hated me because I was diffrent, etc so he opened the pen when my family and I were out and let in his black lab. I returned home to a bloody mess of feathers, etc in the yard. Which left me quite upset(I never got new ones to replace the ones I lost and I quit eating poultry a bit) and then the boy preceeded to taunt me about it for months saying I was next. Tho I knew he did it and my parents did suspect there was no way of proving it so he never got in trouble for it.