I was looking at some literature on rickets in puppies for our shelter and ran across this. It says biotin is a cure for eating feces. heres what it says and then I'll post the site for any of you that may want to read it.
Biotin is a cure for dogs that eat their feces; they may be looking for this vitamin, which is produced to some extent in the intestines. Raw egg whites contain an enzyme that depletes biotin. For this reason, eggs fed to pets should be cooked to deactivate this enzyme.
Can read more on this here
http://www.paw-rescue.org/PAW/PETTIP...p_vitamins.php