Spike explains to his son the rules of being a dog: 1: be man's best friend (begging, lying at feet); 2: bury bones; 3: chase cats. Just then, Tom (and Jerry) run by, offering the perfect practice subject. Spike lectures Tom to be scared by the pup or else; Jerry overhears, and is soon doing his best dog impersonation, while Tom works on various strategies to neutralize Tyke