One of our dogs, Annie, came home in what we figured was pretty severe shock one night about two weeks ago after being out running for a few hours.

She was shaking and panting something awful and could hardly even stand up after she got home. My wife and I expected she might die, we're at least an hour and a half away from any emergency vet and since she wasn't busted up at all and we couldn't find a mark on her I figured she'd either die before we got there or recover on her own and the drive wouldn't help none with that.

We covered her with a blanket and gave her water and a bit of roasted chicken and she mostly recovered after a couple hours or so, and was fine the next morning. We never found a mark or any swelling. We ended up figuring she probably was a little snake bit, but it's hard to say. She might have got knocked in the head by a deer or smacked by a bear. Whatever it was didn't stop her from running off to chase stuff in the forest though.