I want to get my dog back on Evo which she ate for seven years until the recall last April. On Evo she had tight small stools, produced without straining. All the foods I’ve tried since cause large, frequent, soft stool with a lot of straining. I have tried to reintroduce the Evo by giving her 1/3 of it and 2/3 of something she’s been eating for months and twice she has thrown it up 9 to 12 hours later. She has not thrown up anything else. Should I try again?