I think it's always safest to assume that dogs and chickens don't mix and always keep them separated preferably by a fence. After some time, introduce your dogs one at a time to the chickens while the dogs are leashed. Let the dogs know that chickens are not chew toys or their next meal. You will probably see right off if any dogs are going to be problematic with the birds. I strongly discourage letting 4 dogs run around with unattended chickens. Even if most of the dogs are fine with the birds, all it takes is one ringleader to turn on the "pack mentality" and you've got a bunch of dead or wounded chickens. I used the introduction method for my 2 dogs with some occasional verbal reinforcement as needed, and my dogs leave the chickens alone, but I also don't leave them unattended together. I only trust them so far.
Welcome and good luck.