Pechu had been rushed to the surgery late in the afternoon with suspect poisoning. She had eaten a whole load of slug pellets that are very toxic to dogs and was now showing the first signs of toxicity - trembling and shaking violently.
We made her vomit with an injection and saw that there had been quite a few pellets in her stomach.
After calling the Veterinary Poisons Investigation Service (who are awesome), we stuck her on a drip and she took a ride home with me overnight so I could keep an eye on her.