After the first contact is made, be as submissive as possible
like pup howls, kiyi's, or even some prey distress. JMO
If the snow was lousy for moving up on them, then I'd probably abort too.
Maybe if you could back out quietly to the truck, and drive to where they're headed or the opposite site of where they're hanging up, might work.
Ive heard that sometimes, a stream bed, logging road, or some other natural border could stop a canine from coming all the way like
a fence to a turkey.
JMO