I'm glad to hear your dog is ok..the same thing happened to mine (see picture below) we went for a walk in the woods one day and she started shaking and then layed down and started breathing heavy..then out flat on the ground..eyes glassed over..now imagine I'm 115 soken wet and shes 65lbs..I had to pick her up (no easy chore) and carry her limp back to my car and rush her to her vet. found out she was bitten by something and now have to carry Novohydroxyzine when ever I take her somewhere near woods..I know how you felt..trust me...but she's been fine lately..but sucks because we like to go camping.. take care of each other
