Cissy has thrown up the last 2 nights. Only once each night, first night just yellow bile, last night had 2 very tiny bits of food with it. This is our first (knock on wood) experience with any sickness. She is 7 months and 7 lbs (can't tell you how many times I hear - "She is sooooo Big")

She eats Wellness dry free feed and Wellness canned for supper (around 7pm) - same food since she has owned us, no changes, no new treats, etc. The vomiting happened in the wee hours of the morning. No other ill effects, everything else seems normal. Any ideas?? Any advise? Please!!