Have a bitch that will play with her or any other puppy till about the age of four months old then she at about that time she wont hurt them but she also not rolling on her back for them anymore!
But all puppies are allowed to run the yard free when we are doing yard work!
For me the older dogs teach them how to be a dog early on. And they learn pretty fast whos chain spot they are no longer welcome in and who they can ruff house with! Our one bitch who is the baddest head doctor i have seen will allow pups to eat their share of her feed first then eat wats left!
Now i will never allow the same sex to run in a pack as these dogs turn on pretty young and thats why the older bitch become strick with them to keep her pecking order!
Even to the order in what you feed creats a pecking order! Feed the first dog last when he or she has always been first to eat and watch how the become very vocal and the sudden change up!
I myself would never try the pack thing with dogs that are grown ,but we have done it with young dogs 3-4 months till they were two three years old. We also have two litter mates brothers who were raised together very close that are both GAME dogs who will killing anything else but could careless about each other!
Running bulldogs in a pack is not the best idea or for green horns as you have to be able to read their body language and know if somebody is thinking about challaging another for a higher spot in the pecking order! The one bad head doctor will run lose and not bother any other dog on the yard she plays with her half brother but will tear into anything else and the same for her half brother will scratch into his own shadow but play with her!
If you can understand a dogs world and keep a sharp eye on them to nip any chances of a scrap then it could work, but,but is it worth the risk of a scrap with two and have five other get excited and now you stuck trying to break up seven GAME dogs? For me naw, we let the ones that know whos chain spots to enter run loose!