This is stagnation of blood in the lungs and is always the forerunner of inflammation, which can often be prevented if treated early.

Causes. - Driving against a cold wind; rapid driving when in a debilitated condition, especially when just recovering from any of the distempers; standing in a cold current in the stable, or standing out without a blanket after driving often produces it.

Symptoms. - The horse becomes sluggish, stops, stands with his fore feet spread apart; stretches his head forward and gasps for breath; his nostrils flap; his flanks heave and he often seems about to suffocate; the eyes have an anxious look; the body shivers as with ague, and cold sweat breaks out all over it.

Treatment. - Treatment must be prompt. Remove all pressure upon the chest or throat from harness or saddle; blanket the body; give plenty of fresh air, and cold water in small quantities, but often; rub the body dry with wisps of hay and cloths; give from one to two ounces of spirits of nitre and one-half to one ounce of laudanum or fluid extract of lobelia in half pint of water. This should be given at once and repeated in one hour if the symptoms do not abate. It is best given with syringe. After the distressing symptoms have been relieved the animal should have two drachms of nitrate of potash and one drachm of sulphate of cinchonida every four hours for at least twenty-four hours. This may serve to ward off inflammation of the lungs.