They do go into the coop to roost at night. I’m looking for a solution (a pasture roost?) for during the day if the dog jumps the fence that the chickens have a way to get UP away from the dog. I’ve thought about using an orchard ladder and building cross supports like this to have in the pasture? But not sure if there was a better idea?
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An alternative might be to put a few tall posts in the ground, and attach boards or branches between the posts? I don't know how high it would need to be, to keep the dog from reaching them when it jumps.
Depending on the size of the dog, maybe make some hideouts with chicken-sized entrances, so the chickens can run in and the dog cannot? I'm visualizing something like a 3-sided shed with the front covered in large-hole wire mesh that chickens can go through but a dog cannot (maybe a cattle panel for the wire mesh?) But it would depend on the respective sizes of the dog and the chickens, and might not be possible if the chickens are big and the dog is good at squeezing through things.
Have you considered (or already tried) adding electric fence to the outside of your existing fence? That could probably stop a dog that climbs the fence or digs under, but would probably not help if the dog just takes a giant leap and goes over (because a dog in the air would not get shocked, just like when birds sit safely on power lines without getting shocked because they have no contact with the ground.)
Dogs owner and Animal Control are being little to no help with the situation. Owners=denying it. Animal control=just giving owners warnings.
Many states do have laws that allow you to kill a dog if it is chasing or killing your livestock. So that might be one option

I am not really in favor of killing dogs if a better choice exists, but there are times when nothing else will work to stop it kiling the chickens. (I do not know what other options may work or not work in your case.)
Or something like a live trap might work to catch the dog. I don't think a dog would go into a trap while it could be having fun chasing chickens, but it might go into a trap if it came during the night, when all the chickens are safely locked up. Or it might go into a trap that is sitting outside the fence, if the fence is now tall enough to make the dog stop and think. Depending on the rules in your area, you might be allowed to kill a trapped dog, or you might be able to give it to Animal Control (if the owners need to go fetch their dog back, especially if they must pay a fee, they might think twice about letting it run loose again. That works on some owners but not all owners.)