snorting

The poor little thing was snorting like a steam-engine when she caught it, and kept doubling itself up and straightening itself out again, so that altogether, for the first minute or two, it was as much as she could do to hold it.

Gladly availing himself of this opportunity, the coachman leaped from his box; but Ali had promptly seized the nostrils of the second horse, and held them in his iron grasp, till the beast, snorting with pain, sunk beside his companion.