This generally follows or appears in connection with internal canker, due to the poisonous discharge from ear, causing sores on the flap or edges of ear. The tears and scratches from briars and thorns in working hunting dogs in close coverts, if not given attention, may also set up external caker. Exteral canker is a sore or sores much of the nature of a cancer, a sore appearing on the outside or inside of the ear which eats a hole through to the other side if- not arrested. It is much harder to cure than internal canker. It often exists as a sequence of inflammation, ulceration, or suppuration of the internal passage. External canker often starts, especially.-in hounds and pointers, or any long-eared dogs, with a small sore that gradually eats into the flap until it makes a slit in the ear that continues to grow deeper, and will be perhaps a quarter inch wide. This will be scabbed over on edges of the slit with a thin scab, bleeding a good deal, due to dog continually shaking his head.- Make a hood or cap of a piece of canvas of sufficient length to reach around the dog's head, having two pieces of tape running through a hem at each side lengthwise, by which you can draw the cap tight enough around the dogs' neck behind the ears, and again, just above the eyes, tying them underneath. This hood or cap prevents dog from irritating the ears by flapping them.

Treatment

First wash and dry the sores nicely, then touch the sore edges twice a day with following solution: Sulphate of copper one dram to an ounce of water. Here are several other remedies: Yellow oxide of mercury 15 grains to one ounce of simple ointment. Mix, and use once a day to sores after having first cleaned them. Another is, if any of the sores look "angry" scrape with a knife a little blue stone into fine powder and dust the ear with it; or, after bathing and drying nicely touch them with a point of lunar caustic. As soon as you have cauterized the sores apply a damp sponge or cloth.

Quoting Hugh Dalziel

"There are other cases where the whole of the external ear becomes swollen and tender, the flap thickened and filled with fluid between the skin and the cartilage or gristle; in such cases the best plan is, after bathing the ears well, to cut them with a lancet, press out the bloody matter, and, having again well washed and softly dried the ears, let them be touched with the following:

Lead Liniment

Goulard's extract of lead .................... 1 ounce.

Glycerine and carbolic acid ................... 1/2 ounce.

Finest olive oil ............................. 4 1/2 ounces.

"Mix the two first named, and add the oil gently, rubbing together in a mortar. Shake bottle well before using. In getting the glycerine and carbolic acid from your druggist, I mean it to be one part pure carbolic acid in five parts.

"There is also a mangy affection of the ear which might be confounded with external canker; in such cases the edges of the ear become dry, hot and scaly, and hair come out, but this is not ear canker and should be treated as mange with Eberhart's Skin Cure, applying it twice daily, rubbing it on until ear softens up and gently scraping off the hair with the fingers."