I've gradually changed pup over onto millies wolf heart countryside mix. She seems to enjoy it and her poo is much firmer but the last two mornings she's been sick, the first morning was mostly bile/foamy sick with a bit of grass in and today it was proper sick with whole pieces of Millie kibble. I don't know if it's the food not agreeing with her or if she's just not chewing it and digesting it. She was never sick on previous food but her poos were soft and frequent.