Casey itching after vacation

Hi all, Since we returned from our mountain adventure, Casey has been chewing and scratching like crazy. Is it possible for dogs to get any weird bugs that you can't see with your eye? Or possibly she got into some poison ivy although there is no rash. Any thoughts? We're not used to being in the woods, so I have little experience with this stuff. I gave her an oatmeal bath and sprayed some itch relief spray on the areas she seems to be bothered by, so we'll see if things improve. If not, we'll be off to the vet on Monday.

Thanks!

Sure: ticks, fleas, an allergic reaction to some type of grass, lots of things. Sounds like she picked up something -- I'd at least call your vet for advice.