The Mayor asks Bob to build a Pets Corner in the local park. Farmer Pickles has picked up a selection of animals for it - including a - chinchilla and sends Travis and Spud off to deliver them to Bob. Unfortunately Bob runs out of chicken wire and while Wendy goes back to the yard for some more, Travis and Spud arrive to find the animals' pens not yet ready. Bob suggests that the pets can stay in the lean-to at his yard until the work is finished, but by the time they get there Wendy has gone. Between Spud, Travis and the Machines, the pets escape, but by the time Bob and Wendy complete the pens and return to see how they're getting on, Pilchard has rounded them all up. All except the chinchilla! A hunt around town ensues, with no sign of the creature - until Pilchard discovers it hidden in Bob's filing cabinet. She shepherds it back to the park, where Pilchard is congratulated for being such a clever cat.