My dog acts like she has a stomach ache?

If your dog doesn't normally groan like that when she's just feeling a little unwell, take her to a vet right away. Worst case scenario, could be bloat

It's probably not an allergic reaction, that would cause swelling, hives, etc. It's probably just an upset stomach or gas. If your dog isn't used to eating human food, greasy, deep fried shrimp could definitely cause some digestive upset.

If she's isn't back to normal in an hour or two, call the vet ASAP.

You may want to let her outside for some fresh air.

I doubt it's an allergic reaction. It probably upset her stomach. Keep an eye on her - if she starts vomiting or having diarrhea, take her to the vet.

sure could be bloat which is very important to take dog to vet asap, especially if it is a big dog, our great dane got bloat from eating her food too fast, glad we took her to emergency vet, she had to have emergency surgery right away we saved her life, maybe it is stuck in her esophagus ck her throat