According to the AKC, after health, the next characteristic the family of the dam should consider is the sire's temperament. "Temperament is a hereditary trait in dogs... You should never consider breeding a dog with a questionable temperament." (Click button to access AKC document.)
Romulus is active and athletic, yet gentle and loving. One minute he can roughhouse with an adult and the next play calmly with a child. He's also highly intelligent, easily taught and trained.