. Diseases of dogs, their causes, symptoms, and treatment to which are added instructions in cases of injury and poisoning. Dogs. 38 DISEASES OF DOGS. CAITCER.—Tills is a disease which can only be with certainty distinguished and safely treated by the professional man. Fortu- nately, however, It is not of very frequent occurrence In the dog, and many authorities doubt the existence of true cancer in the dog. CAI7ZNE Eabies. CANKERED MOUTH.—-See Mouth, Cankee op CAITEEB OF THE EAK.—<S'ee Eab, Cakkeb of. CATARACT.—Cataract consists of the presence in the interior of the eyeball o
. Diseases of dogs, their causes, symptoms, and treatment to which are added instructions in cases of injury and poisoning. Dogs. 38 DISEASES OF DOGS. CAITCER.—Tills is a disease which can only be with certainty distinguished and safely treated by the professional man. Fortu- nately, however, It is not of very frequent occurrence In the dog, and many authorities doubt the existence of true cancer in the dog. CAI7ZNE Eabies. CANKERED MOUTH.—-See Mouth, Cankee op CAITEEB OF THE EAK.—<S'ee Eab, Cakkeb of. CATARACT.—Cataract consists of the presence in the interior of the eyeball of a whitish opaque spot, which gradually enlarges and very often ends in blindness. This opaque spot is situate on the crystalline lens. It frequently follows ophthalmia, but it may be the result of inflammation or of a wound or blow. It is com- monest ia aged dogs, and is then an evidence of failing health, and the probable breaking up of the system. Nothing short of an operation is of any avaU. Fig. 10 is the crystalline lens and is the seat of cataract. It is made up of concentric laminse, and when hardened, by immersion in alcohol, it can be peeled in the same way as the layers of an onion can be removed. It is composed of a capsule and lens : if the cataract is situated upon the lens, it is known as a Fig. 10. Crystalline lenticular cataract, but if confined to the cap- Lens, showing the , ., . , , i 4. -D iU Layers 1,2,2,2, sule it is known as capsular cataract. Uotn structures may however be involved, when it is known as capsule lenticular. The hardest portion of the lens is that most centrally placed. CATARHH, OB COLD IN THE HEAD.—Dogs that live in freedom, although much exposed to changes of temperature and weather, are not so liable to attacks of catarrh as the more delicately reared, in whom a sudden change from the close atmo- sphere of the room to the open air, or exposure to a drenching shower, frequently produces cold. The first symptoms are shivering a
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