My rooster flew the coop in a dog attack yesterday and went a good 200 yards away from the coop, when it happend a month ago we had at least 10 chickens scattered within a 100 yard radius, took all of 3 hours with 5 people to find them all, they went into thick grass and raspberries bushes in our case. We had ours trained to corn shaking in a cup so we went around doing that. They were all still scared so it only worked for about 3 of them the rest we had to wait a while or find them ourselves. If yoi have something like that you can do or if you can make a sound they associate with you.
Edit: we have a 3 ft chicken wire fence that the dog jumped, we didn't have really any daytime predators till these people moved in with their husky first one ran through the invisible fence second one there 3 year kid old let out. Killed 3 chickens in 10 minutes the first time while we were at the feed store second time killed 3 in 2 or 3 minutes. Different dogs same owner, I would have shot it the second time if it was the same dog, but should have shot it anyway. Haha I charged 145 the first time for the 3 dead and 4 injured but this time I'm charging double for 3 dead and 4 injured and for screwing up twice in one month, they could sell that dog and make all their money back if they really needed to.