Dr KittyCat is Ready to Rescue: Posy the Puppy

After a busy clinic sorting out the bumps and bruises of the hopeful contestants practising for the Paws and Prizes sports day, Dr KittyCat and Peanut get an emergency call. Posy is stuck in the agility tunnel and she won't come out. Has she injured her leg? Or could there be another reason why Posy was so worried about being fit for the sports day?