After a lot of experimenting, I have found the perfect ale to go with the pie (Also perfect for Shepherds pie, Cottage pie etc): Guiness West Indies Porter. It's in the brown bottle with the yellow label and red writing. You're welcome :)
When you said buffalo I was thinking Bison, which I grew up eating & it's DELISH!! Is water buffalo different tasting than Bison? There's a difference in taste between deer & reindeer, I love both but prefer reindeer... sorry Rudolph
Was expecting actual horns sticking out of the pie Desperate Dan style. Yes I have no idea HTF that would work, but then I'm not the master chef. Very disappointed.