I have a <1 year old male golden retriever and I was surprised to learn that he has a very strong guard instinct and will not STFU with his loud, deep barking any time he hears a strange noise, or some stranger is walking by.
That said, this is a feature, not a bug. "Early warning system" was in the top two features I was looking for in a dog.
Great Danes are famously couch potatoes but mine could not stay still and demanded a ton of exercise - still it was the exception rather than the rule for that breed.
The myth of breed behavior is not good. It's the reason so many pitbulls are put down. They are absolute sweethearts until you abuse them and train them to fight.
They also have repeatedly cornered plumbers, electricians and HVAC folk. When we're expecting someone, we lock them up in the bedroom.
Maine Coons are cats.
