I'm not sure this is where to post this but I know Dr. Jeff recommended PRO BI™ for Pets somewhere on the forum.  I finally went to purchase and they are having a huge sale!  It doesn't need to be refrigerated and it doesn't go bad.  
PRO BI™ for Pets (abcplus.biz)
				
			PRO BI™ for Pets (abcplus.biz)