Bertie finds trouble everywhere, and in this trio of adventures he has plans for his dog's fleas, locks a substitute teacher in the storeroom, and has an encounter with a fire engine.
As his brother prepares to leave the dog they share, Fred the greedy flea pretends to have the flu in order to stay behind and have the whole dog, unaware of the fate that awaits him.
Takes a close-up look at the physical features, habitats, feeding method, life cycle, and jumping abilities of fleas, and introduces several other tiny bloodsucking animals.