The Larynx, situated at the top of the windpipe, is not so often the seat of acute inflammation as in man and the horse, but chronic laryngitis is by no means unfrequent in the dog. Both are recognised by the hoarseness of the cough and bark, and by a rough sound in breathing, sometimes very audible at a short distance; and accompanied by a certain degree of increased quickness in respiration, varying according to the intensity of the attack.

The Treatment will vary according to the acuteness and severity of the disease; and if this is urgent, bleeding and emetics will be necessary, followed by small doses of calomel, digitalis, and nitre, as prescribed at page 13. If, on the other hand, the more common form of chronic laryngitis is developed, remedies of a different nature must be adopted. A seton should be inserted in the throat, and a good discharge from it promoted by the application of blistering ointment to the tape. Iodide of potassium may generally be given in one, two, or three grain doses, with five or six drops of ipecacuanha wine, and five grains of nitre three times a day, mixed in a little water. When this has been given for a short time without benefit, any of the warm expectorants given at page 12 may be tried; and sometimes one, and sometimes another, will be of service. The dog, during the continuance of this disease, must be kept rather low than otherwise, but not rigidly starved, as is necessary in some inflammations of the respiratory organs, and should have a fair allowance of walking exercise.

Pneumonia, or inflammation of the substance of the lungs, must be distinguished from pleurisy (inflammation of the pleura) and bronchitis, which, when simple, is confined to the lining membrane; but very commonly there is a combination of two out of three in the same attack.

All are characterised by fever, with quickened respiration and pulse; generally there is cough, but not always; and in all cases there is great anxiety depicted in the countenance. The following series of symptoms mark the difference between the three forms of inflammation, whether acute or chronic: