There's a lot of debate about the subject, but I personally would not feed any kind of dog kibble to rodents (heck... I don't even feed commercial dog kibble to my dogs) if it can be avoided. The nutrition isn't right for rats, the ingredients are often of questionable quality (especially with cheaper dog foods), recalls are a concern. I personally just don't feel it is necessary if a good quality block or other diet without dog kibble can be provided.