Call a rescue or animal control.
Some people shouldn't own pyrs. They are livestock guardians (i know, I know, they chase your chickens, so they weren't raised to protect chickens)
Pyrs NEED fencing. Period. If given 5 acres, they want 50. If given 50 they want 500. I don't know if those dogs have jobs (do they guard livestock?) but they need jobs AND fencing. I have 2. They protect my chickens and turkeys, but don't let a single other bird land on our property - from hawks and owls to starlings and pigeons. They don't know the difference. But you shouldn't own a pyr if you don't fence them in! And they don't come when called if they think they are working. Heck, I hope my dogs would ignore me if they were fighting with a coyote! Mine do generally come when called, UNLESS they think they see a threat.
I'm getting off point. The owner of those dogs needs to be more responsible. And ANYONE in their right mind that thinks an un-fenced Pyr is going to learn to stay on their property when unattended is fooling themselves. You can train some dogs that way, but Pyrs are guardian dogs and they want to patrol what they think is "their" territory, and if they aren't fenced in or fenced out, then they think it is THEIR territory!
There must be laws in your area about dogs that are on the loose. Call and report them. Maybe go talk to them NOT during an incident and explain what is happening. Maybe they just don't get it, or realize that it is a big deal. Also, I don't know what type of dog you have, but a pair of Pyrs can tear a coyote in two, so don't send your dog out if you think these pyrs might treat it as a threat and attack. That doens't help anyone to have a bunch of injured dogs.
Keep a lot of all the times the dogs are in your yard, and consider some temperary fencing around your chicken coop area to protect them until the neighbors solve the problem. But those folks need to know that Pyrs need fencing and a job, or they will look to run loose. And they can cover a lot of ground, so they might not JUST be bothering you!