Glad that the sheriff has been notified. Additionally, I see no purpose in having unsupervised dogs roam around in rural areas because all they do is get into trouble.
I see irresponsible dog owners all the time as some towns locally have no leash law. There are always news reports of dogs threatening pedestrians, kids, the elderly etc. Additionally, as a child of 8 I was bitten by a German Shepherd without a leash at a shopping mall. My dog has been attacked multiple times by dogs without leashes in stores (Petco) and @ public areas. Just great. Of course, all these dog owners try to slink away as quickly as possible.
I was also surrounded years ago by a trio of dogs on a uphill climb in Marin County. I also had to dismount, use the bike as a shield. I also had a long Zefal hand pump which the dogs did not appreciate. I think having something that resembled a club set off a primordial fear reaction in the dogs which kept them away??? I just love it when you can see their gnashing teeth.