I found this at http://www.rottweiler.net
concerning what vit k is used in PC Nutrition First:
"I just got info back from PC First Nutrition.
**"President’s Choice 1st Nutrition Chicken & Brown Rice Dog Food does not contain Menadione or Ethoxyquin. The source of Vitamin K is K1.**"
I assume that is a good thing. You can read the whole thread here: