Oh yeah the bite stuff. Its only been 6 months since we got Wally and I almost forgot about that. They are mouthy for the first few months. Just make sure you have something to give them thats "theirs" when they start in on the biting.
The hardest part was my girls. They are much younger (2 & 4) than your daughter and he thought they were littermates. He would literally start running at them full speed and launch onto them like they were pups...teeth and all. Most of my girls shirts from that period have nice little bite holes from those SHARP puppy teeth. The common phrase was "MOM - Wally's Got Me!!!"
He didn't want to hurt, just play. So when you made a sound like you were being hurt by the bites he would jump back and stop. Kind of like a loud squeak. It only lasted about 5-6 weeks before he passed through that phase. Being firm and consistant.
I am so glad your big guy got along okay with him...they will end up enjoying each other's company. My little guy is heading off to hunt camp on Thursday and I am going to miss him tremendously!!! Please let me know if you need any lab resourses in Nor Cal. I am located in Sacramento. Congrats and looking forward to hearing how surprised your daughter is!! Yeah!!!