I have just found that some flavoured yogurt contain Gelatin in them.
Make sure to always check the ingredients before you buy them.
Who can imagine beef gelatin in yogurt.
http://www.yoplait.com/yoplait-in-action/frequently-asked-questions
Why does Yoplait use gelatin?
Gelatin gives consistency and texture to yogurt and Yoplait uses kosher gelatin that’s beef-derived. Yoplait yogurt carries KD (Kosher Dairy) Certification, certified by Rabbi Barnett Hasden. New Yoplait Greek and Yoplait Greek 100 are great options for those looking for a gelatin-free Yoplait option. Activia Yogurthttp://www.wegmans.com/webapp/wcs/stores/servlet/ProductDisplay?productId=625978&storeId=10052&langId=-1
Please check the brand of your flavoured yogurt if you eat any.