TJ, i think the problem stems deeper for you though. It sounds like you freak out as soon as you see a dog off leash even if that dog is not acting aggressively, barking, jumping up etc. This is your problem to deal with in the shared countryside and your phobia is the problem not the dog.
As already stated, if the dog is being agressive, being dangerous or jumping up at you then this is not acceptable and is the responsibility of the owner to keep that dog away from you.
There are a lot of people in the world who suffer with irrational fears such as the fear of cats – Ailurophobia. This doesn't mean though that they can insist on all cats been kept in doors or off the streets because they may encounter one.
I think everyone understands that you have issues, no one is critising the issue, but you need to learn that your irrational fear of dogs is not the dogs fault.