Compression may arise from fracture of the skull with depression of the broken bone; from extravasation of blood on the membranes of the brain, or into the substance of the brain itself; from morbid growths, etc.

Symptoms

The symptoms of compression vary in severity with the cause; but there is always, in a fully-developed case, complete loss of consciousness, suspension of the special functions, loss of muscular power, etc. The dog is, of course, unable to stand up, and utters occasional moans.

In addition to these characteristic symptoms, there is a wound of the scalp and effusion of blood under the skin, when compression is due to fracture of the skull. A case is recorded of a dog sustaining fracture of the parietal bone with depression, from a quoit falling on the head. Symptoms of compression came on. The depressed bone was raised, and the animal recovered.

* For the dose, etc., see "Introductory Remarks."

Treatment

In compression from morbid growth, no treatment can be put in force. When it depends on extravasation of blood, the treatment advised for apoplexy should be resorted to; and if, on careful examination, it be clear that there is fracture with depression, the only rational treatment is to cut down upon and raise the depressed bone. The after-treatment consists in keeping the patient quiet, and on a low diet) and in giving Aconitum and Belladonna in alternate doses every two hours.