Doodles is jealous of the new dog, Squiggles, and is so naughty that Max punishes him. The Tweenies make collages of the two dogs, and Doodles learns to make friends with the newcomer.

Doodles teaches Izzles lots of things, but allows Squiggles to take the blame for his mistakes. In the end, Doodles learns to be honest, and tells the Tweenies that he has behaved badly.

Max and Judy have to make a decision about Squiggles' future with the Tweenies. Doodles has a word with her and Squiggles starts to behave. The Tweenies are delighted that Squiggles can stay now she is behaving herself.