Raw milk...also referred to as 'pet milk'....if you are fortunate enough to live close enough to a local diary farmer, check with them, and see if they have it available...I purchased some and gave it to my furids...they LOVED it...and it's very good for them! We have an organic dairy farmer out in Greenfield, and that's where I purchased mine (p.s., it's good for people too...but don't tell them you're going to drink it!)