i don't think the livestock dogs will work for the kids.they are so serious and don't really play,at least not the ones i know.not sure how they would be if the kids were its job tho.
i have only met one BMD and it was owned by a vet.this dog was a handful to say the least.always challenging her and even hurting her.now i wouldn't have put up with that but maybe twice so it was probably just her and not the dog.
newfies are a delight,i forgot about those.i just wonder how they would do in Ga heat and it would be in the house.i can handle the hair but don't know about the drool.i could do a lip tuck,tho.
my son is 6 and daughter is 3.he is ready for a dog to grow up with.he is putting my heeler on a leash and feeding her and walking her.but she still only responds if i say its ok.
i just have a picture in my head of the kids and a big hairy dog.IDK
The LGDs dont "play", you are right. They do enjoy kids and are gentle with them, but I usually say they treat the kids as if they were THEIR pets, not vice versa.
Berners arent usually like that, she may have gotten a lemon!
The heat could be a real concern for most of the breeds you like. Newfs, Leos, BMDs, bullmastiffs are all fairly intolerant of heat