Iqbal no it is not a Dall sheep,they are similar to the rocky mountain sheep but are generally a white colour and of course have different horns too.

But in reading that post by WH ..what about the 12,000 ft elevation?holy shiit i would be crook with altitude sickness up that bloody high.WY how in the frig do you hunt so high>My mate in TX was telling me he could hardly lift his feet at 10,00ft when he was in the Rockies.