I'm sure your dog will be fine :] Jo, when she was a pup threw up ALL the time! I didn't know what it was, and when I took her to the vets they said it was puppy flu..so I felt a little better..but she kept throwing up, so i thought it couldn't be that..(and it was yellowish - I think Bile is green..atleast in humans..?) so i took her to a diff vet and they did something..i duno what..but she had LOTS of pills..but it made her better, now she like never throws up
(It could be like chyme from the stomach or something...)

I'm sure your dog will be fine though!