The petite Chihuahua breed is perfect for small living spaces. Weighing in between two and six pounds, they are comfortable in any area with a warm bed, furniture or any soft spot. They can meet their fitness levels just by running from room to room. They can have a habit of excessive barking, but you as the owner can train the dog to keep the barking down. Chihuahuas are cuddly, affectionate, intelligent and very quick to learn.