The bony covering of the brain is very strong in the dog. They are liable to accidents from falls on the head, running full force against some obstacle, or from a blow, which may cause concussion of the brain. The dog will lie stunned or insensible, breathing feebly, and pulse small and quick. In treating, examine the head for fracture of the skull, and, if bleeding, stop it by cold applications. In cases of this kind consult a good veterinary surgeon. Until he comes rub brandy or whisky on the gums and keep the body warm. If you have on hand ammonia hold it to the nostrils.