Walking on Ice

I guess that it would sometimes be advantageous for humans to walk on four legs, like dogs do, instead of two. We walk quickly over ice on four paws, this is more than two. We can have more than one foot on the ice all the time. We walk without the need to worry about falling so far as humans who walk upright. On snow with an icy crust, we do not fall through the crust as easily as humans do - which is also due to our lesser weight.

Off course, humans have other advantages with their hands on their front legs/arms. The hands is something to envy a bit. Over all, however, I think dogs have more advantages than humans do.