I'm just now catching this thread. I too feed TOTW. I recently switched Arabella from the High Prarie (bison) to Pacific Stream (fish) just to give her some varitey. But you mention gas before, the bacon grease could be the cause for that.
Pam, Mom to
Thor-male brindle 05/24/01
Arabella-female brindle 12/19/06
Star-at the bridge 05/13/98-11/22/08