Sounds like your dog already knew the snowblower was dangerous
before it tried to eat him!

(I'm really glad he wasn't hurt!

)
Some have pointed out quite correctly that a person should always use a stick to unclog a plugged snowblower but you have to be very careful even with a stick.
If you poke it down through the snow blockage and the end connects just right (or should that be just wrong?) with the impeller, it could get batted right out at you. If your face happens to be in the way...well, you can figure out all the bad things that could happen if you get even a blunt end of a stick slammed into your face!