Kids rule
Ditto to all the above, we had our boxer puppy 4 weeks ago, he is now 14 weeks, we also have a 12 mth bengal cat and 3 year old daughter.
The first thing I did was set house rules, in my case they were mainly don't let my daughter pick him up he's only little and cute for a week or two pre mega growth spurt, nobody to let him put his paws on them (i.e. when sitting on the chair the dog would put his front paws on lur knees for attention - a dominant gesture) and no tug of war in the house (shame I know but I can't risk him grabbing her clothes or toys as she breezes around), my dh plays this when out walking - apparrently less competitive outdoors as it is considered more of a social interaction or prey instinct than a matter of dominance.
My daughter happily gets involved with care of the dog and they are becoming really close. First i asked her to tell him "off" and to fuss him when he obeyed, she went around for days checking he doesn't jump on furniture / people etc, she loved it - someone to legitimately boss around !! I would reinforce the command as she said it initially as he didn't listen to her, but with lots of other commands now coming from her, he listens ! She makes him sit EVERY time for a treat (the repetition is proving great for his obedience) and loves to pretend to eat his food (knows his place in the pack)...I also encourage her to brush him and bathe him etc, and to gently take her things from him (which he sometimes steals) - those things that help the puppy understand that we are leading the pack, and my girl loves to do these things as it beats dolls !
The only problem we have with them is that she occasionally will sneak him a treat off her plate when she thinks we aren't looking and will protest that he loves it so much when we catch her ! LOL (trying to avoid him begging) and she once fed him a whole bag of treats in an hour (hidden in her pocket) upsetting his tummy ! But to be honest letting her give him plenty of rewards for commands has gone along way towards building his need to please her !
Honestly she's better than we are with him as she's 3 and hardcore !!
We explained she should never ever shout at him or hurt him, this she has fully taken on board, if I'm getting irate with the pup, cat and girl, she'll gently remind me not to shout (she knows my tolerance levels by now obviously) and will trot off to find a distraction for the animals. She is a great puppy trainer, and the dog truly loves her for it !!
Today I came home to find her thoughtfully engaged in a giant jigsaw, the dog flopped beside her and periodically she'd reach her arm over to stroke him and tell him she loves him ! Beautiful.
Good Luck x
Jaycee .