Carl

It's too case by case to make a sweeping statement. Sometimes a pet's quality of life is extremely bad, sometimes an animal's instincts will tell it to stop eating, sometimes you could have an old pet that does that and think that they're going but then it turns out they have a totally treatable kidney issue and go on to live five more years after two weeks of pills. That last one happened to me with my thirteen year old cat who went on to live until eighteen.

I wouldn't put down an animal unless they were suffering and an expert told me there was no way out of it - but of course that's easy to say in isolation, when in the real world vet visits cost money. I guess what I'm saying is that I wouldn't judge someone on the decision they made for their pet unless it seemed that they were acting without compassion and didn't consider all alternatives.

break the lever so that it cannot be pulled

they knew

there should be a "block instance" option in your settings, though I don't think that blocks them if they post in a separate instance which is the whole point of the fediverse.