The gang thinks that palmer has a pigeon because it flew onto his head
Palmer has to sleep down stairs with the pigeon because of tonight on cake warning him about the boys coming
They come the next day and asks who nipper is
Therefore Palmer had to make a quick lie
Palmers lie was not good anough for the boys so they planted the cat panther in his room in hopes that it will catch the bird Nipper .
Because of the boys he tells Dorthy to release nipper to keep him safe but he get capured in the crates so Palmer had to save him . So if nipper never landed on his head Palmer would have never had to go through all that trouble keeping him save .