like the other 2 posts ,don't kennel them at the moment,the old dog will kill the pup.introduce them bit at a time.walk the pup on the lead when you take out the other dog or dogs,keep the lab pup on the lead even when you let the other dogs off for a run,this will do two things it will help to make the pup steady and feel safe being with you,the other dogs natural curiosity will kick in and they will come up to the pup,keep like this for awhile,but you must make sure the dogs all know that YOU are the Alfa dog and that the new pup is both accepted and protected by you,theye ill soon sort out