I had this with Betty a couple of weeks ago. She was sick about 6 or 7 times while we were out on our morning walk. She brought all her breakfast up and then it was mainly yellow frothy bile and grass. The grass looked like she had just eaten it though. She was sick once more at about 5 o'clock.
I fed her half her tea in the evening but she brought that up 2 hours later so the next morning I gave her a bit of boiled rice and some yoghurt and then the same for her tea with a handful of food and she was ok.
Hope Woofie recovers quickly