If predator has expereinced shock and cannot determine if fence is hot or not then it generally will not challenge fence if it is standing. I get protection even with snow because predators have already learned to avoid it.
Very true You get some protection.. But dogs are dropped off that have not been shocked before. Wild animals are born, raised, and weaned. They then go searching for their own hunting territory.
I'm still wondering why the fence did no stop the dogs. If the OP could figure that out there might be a very easy fix.