Gave my dog her normal dinner ,and she brought it back up. She doesn't normally do this. She sat and guarded it for a bit which is why I couldn't clean it up.

She then ate it. Gross I know. Is she likely to bring it back up again?
She appears her normal cheerful self. Is it just a dicky tummy?

That is nothing to worry about, I feed my dogs raw and one of them often brings it back up and then eats it.

Don't worry dogs and cats do that and sometimes each other's !

Wait til she starts eating her poo.

(You need to get her out of the guarding thing though)

The Bible has a verse about it so it's very old thing

http://biblehub.com/proverbs/26-11.htm

A Labrador (Tramp) we had would eat his own vomit.

One particularly memorable occasion, was during a family BBQ, when a jacket potato, left for cooling dropped on the floor.

Tramp, pounced on it, snarfed it in a second (it was still hot) and ran down the garden in triumph.

A couple of minutes later, he is in the middle of the garden, bringing up a nearly whole potato. Which he promptly re-eats. Presumably, it had chilled on the way down and back up

Although a pedigree, with an impressive lineage (on paper) he was the last of the litter to be homed, quite late.

I know why, he was disgusting. Cute, lovable, loyal; the best dog any family could want, but totally disgusting.

If we took him for field/woodland walks he would find poo, any poo, cow, fox, another dog, and roll around in it, then lick himself to eat it.

OP: I wouldn't worry too much, unless you see a change in her character.

Cats are far too fastidious to do that, in my 60 odd years I've yet to see a cat do that; dirty dogs are known for it. I once had a pedigree Doberman that ate the contents of a baby's nappy.

Actually I've seen my cats do it too. At least they didn't eat their poop though.

One of our cats did, always ate the smallest cats poop I think she thought she was mum and was looking after the little one. Many animals do it we find it unacceptable but it's just nature at work.

That's nothing. My dog has eaten sheep s**t, one of our chicken buried 4 weeks earlier, road kill, and a rabbit he chased and killed in the field.

The only bit that's an issue in your case is her guarding stuff - snap her out of that if I were you.

I don't believe you two had cats there, they were dogs disguised as cats (or delinquent cats).