at what point do i start to worry?

According to my dear sweet husband... Annie was sick again today. All over her bed and the floor. He's currently cleaning all that up. What a lovely thing to come home to. Sigh. She was fine all yesterday AND this morning. I don't know what's up.I'm not too worried yet.. but I can feel it building. I'll not feed her for 24 hours and see what happens. I hate starving my poor dog though.