I've got a 15 week old boxer puppy called beau, came from a lovely home parents not aggressive at all, but they had no children, everytime my children try handle her she instantly starts growling then barks and snaps, she actually growled at me last night when I tried to move her to her bed, I also have another puppy 9 weeks boxer also who was with children from the day he was born and no aggression at all when my children handle him, question is how do I make her realise she can't growl and snap at my children!