I have a 4 yr old male names Butch. I have adopted an 11 month old female, Baby. I had forgotten how "energetic" a young bullie can be. I need advice. Butch acts as if he will have a heart attack after 10 min of play. Should I really limit their hard play time because of the age difference? Also, is it unrealistic to allow active play in the yard and expect non rowdy play when we are all in the living room at night??