226 Veterinary Medicine. 



beyond the air passages and lungs even in specially severe cases. 

 Cases of this kind, however, may come into a kennel with the 

 contagious qualityalready fully developed, as when a dog has been 

 at a show, a coursing meeting, a hunt or elsewhere, where he comes 

 in contact with the infection already developed in another dog, 

 and brings it back in his system. 



The development anew of infectious qualites in previously 

 saprophytic bacteria may be favored by inhala:tion of irritant, 

 gritty road-dust ; of smoke or irritant gases ; or it may result 

 from ulceration and concentrated, septic fermentation in foul 

 ulcers of the gums, mouth or throat. It is further claimed that 

 the sudden suppression of an eczema on the skin, may be fol- 

 lowed by a bronchitic eruption which becomes the occasion of the 

 microbian invasion. 



Symptoms. These accord with the portion of the air passages 

 attacked and the gravity of the affection. There may be first a 

 simple rhinitis with sneezing and foul muco-purulent discharge 

 from the nose ; or it may be an ulcerating mouth or tonsils with 

 extreme f oetor and even retching or vomiting ; this is followed by 

 cough, with or without sore throat aggravated by pressure on the 

 larynx or trachea. This cough is at first small, dry and painful, 

 becoming later of a mucous or gurgling character with a profuse 

 discharge. Mucous and blowing sounds are heard in the lungs 

 without any material change of resonance on percussion. From 

 this point it follows the regular course of simple tracheo-bron- 

 chitis. 



Symptoms in capillary bronchitis. The gravity of the 

 symptoms increases as the disease extends to the smaller bronchia, 

 and the dog is specially liable to such extension by reason of the 

 compact structure of the lung, the comparative absence of loose 

 connective tissue, and the rapid subdivision of the bronchia to 

 their smallest ramifications. For the same reason extensions to 

 the lungs take place readily. When the capillary bronchia are 

 invaded, the breathing becomes more rapid and sighing or pant- 

 ing, the patient sits on his haunches with fore legs apart, and el- 

 bows turned out, or he stands obstinately like the horse. In any 

 case he avoids the normally self-indulgent attitude of the healthy 

 dog, that of extension on his side. 



The cough is very frequent and paroxysmal, and contributes 



