They arrived in Nepal on March 20 and are currently at Camp I and should be headed towards Camp II today. As far as is known, Denali is the first dog ever to attempt the Everest climb. Dogs have made it to Camp I before, but not beyond. They expect that the summit attempt will take place sometime mid to late May, but that depends on weather and conditions.
Here is a picture of me with Denali (the one on the right) during our climb in Colorado during a blizzard.