My dog started vomitting yesterday morning and again last night and this morning. It started out as a yellow foam and this morning it was a white foam. Bella has not been interested in her food and that is very out of character. She is generally drooling for her food and yesterday and today she has showed no interest, but eventually ate hours later. She has normal to soft bowels and urinating normal. She has not gotten into anything that she shouldn't have. The tech at the vet said to with-hold food for 24 hours and give her ice chips. I'm a little worried.