The term 'small pooch' can refer to two different breeds of dogs. The first is the 'LAPDOG, ' which is a six-letter breed of small dog that is known for its loyalty and intelligence. The second is the 'MEXICANHAIRLESS, ' a fifteen-letter breed of small dog that is native to Mexico and is known for its lack of fur. Both breeds are popular choices for small pet owners due to their size and temperament.