'Now then, friend, stir yourself!' he shouted to the horse, but in spite of
the shake of the reins Mukhorty moved only at a walk.
For Jerry knew there was neither anger nor danger in the roughness of the shake, and that it was play of the sort that he and Michael had indulged in.
As the shake grew rougher, Jerry emitted his most ferocious growl, which grew more ferocious with the increasing violence of the shaking.