Ray,
Your story reminded me of two encouters with "house pet" dogs that I experienced about 5 years back.
On a property that I own in southern Colorado, I was tent camping, and just enjoying my land. On a rocky ridge at the back of the property, I encoutered a pack of dogs, most of which were wearing collars, and tags. They circled me menacingly; coming ever closer, ears laid down, and teeth barred. I was armed with a .44, but hesitant to kill someone's pet. I managed to bean what appeared to be the leader of the pack with a large stick. That was enough to break up that party, but the same group confronted me again about a month later.
When house pets pack up, they are wild, and potentially dangerous.
Later, I had the satisfaction of finding the left front paw of that pack leader. I had watched him trailing a mountain lion previously. Apparently, he found that lion; or vice versa!