Roaming dogs were problem, had to put electric fencing around bottom and top of foot fence that surrounds the chicken yard, cost about $200.00 , used to have a problem with a dog digging under the 5 foot fence, then the dog figured out how to tear a hole in the fencing, fencing is 2 inch by 4 inch welded, dog was a pit mix. Dog is no longer a problem for any of the neighbors.
Use the electric fencing on the top and bottom both, lots of predators climb, bob cats, racoons, possums, just to name a few, and the roaming dogs will let you know when they try out the electric fence, really gets them to yelping when they get into it.