Hi, youve had lots of good advice up there. Am i correct in thinking the mini bites was also chicken based? If so,it seems odd that they arent coping with the new food.Are you feeding the correct amount for their weight,as it could be they are getting too much,this can cause these symptoms too. I think i would first check that they have no underlying health issues,then it may be wise researching into other foods that are maybe chicken free,less rice etc. But dont just jump in and buy a new food,try and look at what could be the possible cause of the upset and look into foods that dont have these..For the price of Burns you can get some great foods,that are more than just mainly rice.It may be that you may need to try a fish based food .But see how the vet check goes first.