What has helped our dogs often is feeding them raw green tripe for a few days and after that once in a while to keep their gut healthy. It seems to work as medicine.
I also would look at other foods. I am not a fan of Purina.
Deja, GSD, sable WL, female, born 11 / 2013
Cam, Rough Collie, sable, male, born 8/2015
Last edited by wolfy dog; 01-15-2013 at 05:01 PM.