so Cowcree is intelligent enough to realize when something is a part of Hanzo and not to eat so he def would not bite it. I think the most realistic thing that would happen is that he’d lick it a lot and make everything messy with his saliva.
But I can also see him happily suckling it because he gets reminded of how he got the bottle when he was a calf.
in any case, it would be very messy wet