My dog vomited sometime today what looked like a bright yellow liquid. After feeding her this evening she started vomiting and when we took her outside she kept vomiting (it looked like her food covered in froth and she ate most of it) and scooting on her belly across the yard. Then she started eating grass and vomited that up as well. Now she seems fine, just really inactive and not her normal self. Should I take her to a vet, or just starve her for 24 hours and feed her a bland diet for a few days?