Two brothers are worried about their cow, which is foaming at the mouth, and ask for Peter's help to get to the bottom of the issue. Peter also has a daunting visit to the Greens' farm - Dusty the feline has an injury, but won't be easy to help - she's affectionately known as the `Devil Cat". Elsewhere, an animal lover finds a pigeon with a deformed leg and takes her to Julian, who decides to operate.