My dog had surgery a few years ago and they weren't sure if she'd make it through the night, but they weren't a 24/7 clinic, so she'd be there alone.
One of the vet assistants volunteered to take her home and care for her throughout the night, and promised me she wouldn't die alone. It was one of the kindest things anyone has ever done for me, and I'm tearing up just thinking about it.
She made it through the night, not sadly it turned out to be cancerous and she had to be put down a few days later. The vet didn't even charge me. They were the nicest people.