Can't help you with that Chris, but I can relate! I was brought to a great grinding halt yesterday by a Rottweiller whilst my wife peddaled ahead, ignorant of my dilema. Being into my 6th day of no cigarettes, I was begging the dog to come closer that I might rip his throat out, but alas...twas not to be.
It only dawned on me when he charged, that trying to outrun a dog is tatamount to suicide or at least serious injury. But at any rate, car traffic can be annoying but a dog that brings my freedom to a halt infuriates me.
Maybe I'll ride back there today and taunt it...