The power up beside the dog is the struggle feature. At least, it was back in the early version. (Haven't played the recent versions yet.) Bait out the dog by pressing against the fence. Once the dog gets close, run down to the entrance underneath the building beside the fence, hop over the fence, then break his ankles around the truck as he tries to get to you. Grab the power up, then be ready to struggle out since he is faster than you.