Darn, I hate to read posts like this as it really reeks of irresponsible owners in leaving the dogs out next to a public walkway unattended and in a fence probably not suitable for the breeds involved, and with that one always wonders if genetics, training and socialization also were over looked. I have about 40 years worth of experience with Dobermans and they basically were bred as a personal protection dog, thus it probably wouldn’t be a good idea to try to attack me in a serious manner. They tend to be barky when someone comes up to the house but mine always have had a good ability to distinguish between a threat and non-threat, and I should add mine are trained, well socialized and genetically sound dogs. Most all of the working breeds that specialize in protection do tend to be more protective of their home turf, but that doesn’t necessarily mean that a dog is going to come charging over a fence either. If they were prone to want to be over the fence you are describing they probably already would be. If it were me I’d just walk by in a friendly, regular non-threatening manner and ignore them, but I probably read dogs better than some too.
But again, I’m sorry that your going through this as the owners are not stepping up to the plate for either their dogs or the people walking by.
You might contact your local Animal Control and see if they might go by and have a little chat with the owners.