I know dogs can have a belly ache but what how can you tell if that's what it is? Daisy slept all day on Sunday and was pretty down yesterday. I looked at her stool yesterday it was yellowish/greenish not her normal and then this morning it was the same color with like what i describe as a piece of tomato skin. She's not eaten anything differently the only thing is i put some meat tenderizer in her food. Can that be

I dont want to rush to the vet if it sounds like something is passable. Thank you for your help.