So we're moving Darby (9 weeks) over from the Bil-Jacs frozen that the breeder was feeding to Natural Balance. We're at about a 50/50 mix at this point. This morning after breakfast I saw that she pooped out some whole pieces of the Natural Balance with her stool. Her stool was fully formed, but a little slimy and soft. The Natural Balance pieces were whole (dime sized) and appeared unchewed. I resisted the temptation to save a few bucks by rinsing them off and reusing them. I know that a little tummy upset isn't uncommon when changing foods, but I'm bothered that she's apparently swallowing the Natural Balance whole. She may not be used to doing much chewing since the Bil-Jacs is soft. Should I break up the Natural Balance into smaller for now, or will that just enable her to continue not chewing up her food? Advice?