I have 4 horses. They DO stand around and interact with each other. And when one gets 'lost' from the rest he/she will call out to the others.
I also have 10 hoses buried out back. 1 had the decency to die (He went quick and didn't suffer. Probably a heart attack. 30+ years old.) All the rest were put down by the Vet. All of them were treated for their problem before all hope was lost (if they could be treated, they were. If not, which was 2 of them, they were euthanized).