Happened to me once,its never happened again.
Any dog comes near mine and gets aggressive and it gets booted.
So far ive done a labrador,standard poodle, another lurcher,2 staffy types, collie and a bitza terrier.
Of the owners that were there? Well some were apologetic,some annoyed and one was going to "f@ckin do me" but he didn't, i ran away cos he was massive