I just opened a new bag of Hill's Z/D for my sensitive kitty and found that the kibble looked different than usual. It looks lighter in colour and does not have the usual Z/D smell. This is the fifth bag of Z/D we've been through and I have never encountered this problem before. I'm concerned about using it as my little guy has stool issues. I will definitely call the clinic where I bought it tomorrow but for now, do I feed it to my guys or am I just being over cautious? I hate to cause them an discomfort, and the little guy is going through one of his cycles of stool issues he doesn't need anymore problems.