I found this really nice treat drink in the cat isle, Cat Sip. It's 1% lowfat lactose-free milk with taurine. The containers look like juice boxes. The back of the box says "great for dogs too".
Willow loves milk but I was getting concerned that is would upset her stomach, this seems like a good alternative to our milk.
Here's the ingredients--
lowfat milk, lactase enzyme, taurine.