Alright guys, let me ask which one of their blends you are using? I've tried the 26/18 and the 21/15. My dogs fell apart, but filled the kennel with crap. Is there another blend you are using?
Try to switch the food gradually, over a period of a week or so. Start with a mixture of 25% new and 75% old and feed that for two or three days, then step it up to 50-50, and finally end up with a combo of 75% new, 25% old. might help with the #2.
x2 on the gradual and feed a little less until the dogs get used to it. The dogs will get loose stools if they over eat even with there normal diet.