I think that there should be better and more tranquillising protocol.
However, as long as it was a Vegan vigil, I find the mourning of some animals, hypocritical (yes, I'm Vegan).
OP, Are you worried about what all pigs bred for the food industry are going through, as we speak, in the UK?
I mention Pigs, because they're as intelligent as dogs.
Cows also grieve for the calves taken off them, so they can produce milk.
All animal welfare standards should be higher.
You can't condem people's actions whilst server my Mentally Ill.