You should probably have him checked out. It seems that those were some of the symptoms I've seen on other threads.
You mean AFTER you take him to the Veterinarian IMMEDIATELY, right???
My dogs get pureed pumpkin from the bakery aisle mixed in with the dry. High in nutrients, high in fiber, low in calories, and they LOVE it.
Did you see that some of the MIGHTY DOG line was included in the recall?
Here: http://www.fda.gov/oc/po/firmrecalls/purina03_07.html