In reply to barry donovan:
I have a snow claw which I bought in the UK, but it was some time ago and I can't remember where I got it from now and I'm fairly they stopped importing them not long after I got mine).
But they're great pieces of kit, and not just for shovelling snow, as you say like a digging animal; I've used mine to help get the car out when it's been snowbound, both for digging out and shovelling away compressed snow, but for providing some traction under the wheel too (which is one of its advertised uses!)