Core has been around for quite some time, and it is one of the lowest carbed dry foods available. It is one of the two dry foods I've had in the house for the young ones that won't eat enough wet, just in case Smokey would get into it. They started out ok, but eventually started eating the other stuff around it and leaving the Core behind. The fosters did the same thing. So I no longer buy it.
Avoiding dry food is best. Core is one of the better options if you are going to have one around.