I have had my dog vaccinated and its all up to date but about 3 days ago she vomited and it was once off so I thought nothing of it. Today she has had Diorehea and has vomited once, but this was a big vomit. Her tummy isnt even that big. I tried to give her a dog treat and she took it out of my hand but put it on the floor and went and laid down. She has been active today and hasnt seemed out of sorts at all. Just a tummy bug or something worse?