Rent a set of warm sealskin clothes and winter boots for your dogsled trip.
It is important to have a set of clothes big enough to have layers under. Boots should be big enough so ou can move your toes even having 2-3 pair of socks on.
Anorak in size small, medium, large, xx-large
Pants in size small, medium, large, xx-large
Baffin boots in size 7-13 / 38-46