You may need to do no food by mouth for a day. Your vet can advise you on that. Did they do bloodwork? GI issues and pancreatitis are very common in Yorkies. No need to panic yet.
Was she straining to pee or not even trying? If she wasn't trying, then probably dehydrated still. Are you sure it was an IV and not subQ fluids? Either way, she needs to see a vet this morning if you didn't take her last night (unless she has peed and isn't vomiting).
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