This section is from the book "The Dogs Of Great Britain, America, And Other Countries. Their Breeding, Training, and Management in Health and Disease", by John Henry Walsh (Stonehenge). Also available from Amazon: The Dogs Of Great Britain, America And Other Countries.
The symptoms of influenza at first closely resemble those of ephemeral fever, but as they depend upon some peculiar condition of the air which prevails at the time, and as they are more persistent, the name influenza is given to the disease. After the first few days, the running at the eyes and nose increases, and a cough is almost always present. These symptoms often continue for two or three weeks, and are followed with great prostration of strength and often a chronic cough, which requires careful treatment
The cause is to be looked for in some peculiar state of the air, concerning the nature of which nothing is known at present.
In the early stage, the remedies should be the same as for ordinary or simple "cold." Towards the second week, a cough-bolus (46) or draught (47) will generally be required. When the strength is much reduced after the second week, and the cough is nearly gone, give a tonic pill (62) or mixture (63). Great care should be taken not to bring on a relapse by improper food, or by too early an allowance of exercise. Fresh air is of the utmost importance, but it must be taken at a slow pace, as a gallop will often undo all that has been effected in the way of a cure.