This is a photo borrowed from Andrew to show what a dzho looks like. Yes they really do exist. This is his comment “This is a baby dzho. A cross between a cow and a yak, I think (I hope this qualifies for the Yaks! pool).
Namche is the sort of lowest altitude (3400m) that you see yaks in the Khumbu. Further down, it’s too warm!
Helen took this one.”
Go to the above link for the best view.
Thank you Andrew and Helen