Ron,
having just lost my best friend this week,a 7 year old Chocolate Lab,I am heart broken and have been searching the net for the "why".
http://www.hunt101.com/data/560/medium/DSC00510.JPGOne of the sites I came across about the food we feed our dogs and the problems they have has made me think twice about the Euk I was feeding them.Perhaps a call to FRRCO might offer another option.
http://www.emlabradors.com/flintriverranchdogfood.htmlhttp://www.frrco.com/index.phpI have no clue if this would work but I am tossing the Euk and changing the food to the Black Lab I still have.