I have a shih tzu and it just got stung. I called my vet and he said that most dogs aren't allergic but to watch the dog for the next 20 minutes and if they start vomiting or having trouble breathing then take them bring them in immediately. My dog is fine, acting normal. Hope this helps!
Only possibly if the scorpian has small claws. If not it will only be in pain for a day or 2