Congrats on Run #1...Dare to Dream!
Regarding dogs & bear spray. I was a letter carrier and retired after 27 years with not a single dog bite. The supervisors wanted to give me an award (it's a very rare accomplishment) but I told them not to, because if they had, on my last day I'd probably get attacked by a herd of Rottweilers.
The Post Office gave us itty-bitty pump spray bottles of pepper spray which weren't really effective at all. I carried bear spray in my satchel and didn't broadcast the fact. Had to use it on maybe five occasions, and it worked great.
One time, a shepherd/husky cross mounted a surprise attack from close range. I had to take a couple steps backwards to give myself time to get a hand on the spray and tripped over some small cedar trees. As I was falling onto my back and the dog was about 3 feet from my face I managed to hit it with the spray. Dog turned and was gone instantly.
Another time, two pit bulls attacked, one in front of the other by about twenty feet. My concern was that if one got behind me, I'd be screwed.
The first one was coming in low and hard, with no indication of stiffening up its front legs (like dogs do on a bluff charge) so I nailed it straight in the face. It stopped a couple feet away and stared at me for one or two loooong seconds without blinking, coughing, wheezing, or giving any indication it was just hit by something that can turn a grizzly bear. Talk about tough as nails! It turned and went home as the second one attacked, which turned right away after being hit. The owner saw the whole shebang and said I did the right thing.
I carry bear spray (with a Scat Belt) on my runs around town. Lots of bears, and one day a pit bull saw me coming from a couple hundred feet away, so he sat down beside the sidewalk and locked eyes with me. As a breed, they tend to show zero social signals...it kept its eyes locked to mine the whole time, and watched me go as I ran past it. The Scat Belt is small, holding the can horizonatally in the small of my back.
That said, a very nice lady on my route had a pit bull that was one of the happiest, well mannered dogs I ever met. The two which attacked were owned by the local tattoo artist. Go figure.
Well, enough chatting...silver nitrate coat on the next salt print should be dry by now