The tooth-fairy is a no-good racketeer- a very bad lady. She leaves you just 25p for your tooth and then goes and sells it for two whole pounds. And Santa Claus, ho ho, could I tell you a thing or two about that guy!
Your parents are mistaken, cats and dogs do get along well together. It will be perfectly safe to drop Fluffy over the fence so she can make friends with the Wilson's Bull Terriers.