Because of allergies, five-year-old Edward Fraser and his older brother, Jason, can’t have pets. Edward finds his own solution to the problem. He becomes a dog. In fact, he becomes so good at it, that two friends of Edward’s from school start to act like dogs, too. Soon they sound so convincing that neighbors call the police to complain about the barking and yowling. When the police arrive, Jason wishes he could hide. A younger brother is bad enough, but a pet brother is just too much. Little does he know, three more of Edward’s adventures await.
As Jason enters fourth grade, he begins to think girls are okay, until he gets caught in a tricky rating game. Meanwhile Edward, now in first grade, is trying hard to keep his eyes open when he swings at the softball, to laugh instead of cry in the spooky neighborhood haunted house, and to keep cool when his pet rat, Spike, has a litter of tiny pink babies.