Stomach Ache No Touching I Think My Dog Has A Stomach Ache? Please Help!?

I think my dog has a stomach ache? Please help!? - stomach ache no touching

I have a pug 2 years and only now, she began acting strangely. She has short breaths and if you tap the stomach arches his back and began to shake a little. I will not be able to take him to the vet until tomorrow, so I'm not sure if anyone knows what could be wrong.

Thank you!