Yeah, coulda been an animal. My dog would act a lot like if she spied a porcupine, after having been walloped by one when she was young.
However, I do think she was sensitive to more than I was. We'd spend summers in the country, and there's an old dirt road that ran up past the house into the woods. Back in the day, there would have been fields on either side. There's a local folk tale about a certain area on that road known as the 'high field', where the dirt is red due to a peddler having been murdered there. Susannah (my dog) would always hang way back when we walked past that part of the road, where normally she's bounding ahead.
Maybe your dog's onto something?
"There is a crack in everything
That's how the light gets in."