Ren Playing with an Existing Pack of Farm Dogs

We visited my family's farm over the weekend, where there are three dogs - two of whom are about 7 months old, and sisters. The puppies live in different houses, and one of them lives with an older male dog, but all three of them spend a lot of time together, running around on the farm. None of them are formally trained, but the are all decently mannered, as my sister is a horse trainer, and has enforced some basic dog ettiquite on them.