I've seen stuff even worse than that too. Seen a pig's head being chopped off while it's alive, a dog being gutted open, a crab's head being cut off with scissors, yep, a lot of animal cruelty shit out there on the internet.
I was an veterinary technician for 13 years. Spent 4 of those years working in an overnight emergency hospital. Didn't need the internet to see some awful shit.
What's the worst thing you ever saw?
Hmm. So many different things that are bad in different ways.
The dog dragging itself across the street with his intestines wrapped around his legs was the worst in terms of gore.
The kitten who accidentally hung himself on a piece of string with a feather tied to the end was the most heartbreaking. The owner set it up for them to play with while he was away at work for the day. Poor thing broke all his claws off trying to save himself, and his brother was curled up under the body when the owner arrived home. They were only 9 weeks old.
Worst thing in the way of human brutality was a biker who anally raped his wife's pug to get back at her for an argument they had. Ripped the poor thing up pretty bad.
After 13 years everything kind of runs together. Bad shit every day, just different flavors.