I know this is an ancient thread, but since I have tanned a Heilan Coo hide thought I`d contribute in case anyone else gets one.

I did chrome tan it, so am not sure how popular in this forum that technique would be, however it did turn out fine, and kept the hair on no probs at all.
The worst thing about hand tanning such a large and thick hide is the weight of it when it comes to both stretching it on a frame (and you need a bl**dy big frame for it too!) and in working it soft. I always soften my hides on frames, I`m too wee to sit with a full cowhide and work it by by tugging and stretching it.
Also, you will only get it `so` soft, unless you can somehow split the hide, due to the thickness especially around the neck and rump areas.
All said and done though, the customers were very pleased with it (I think it had been a pet bound for the freezer

)
and a tanned highland cowhide is pretty special to own.
