Books with title Positively No Pets Allowed

Percy is not allowed to have a pet in his apartment building, but every time he writes a spelling word, a remarkable animal appears in his room

Mrs. Goldberg refuses to let her son have a pet until she meets a gorilla named Irving.

When Matthew moves to Vancouver with his mother, he's not able to bring along his dog Lucky, because the apartment building he is moving into does not allow dogs. But when Matthew's imaginary dog scares off a burglar, all the tenants argue that Lucky should be allowed to come live there.