72 THE DISEA8ES OF THE DOG. 



ciable lesions detectable post mortem, a few petechias on 

 the lungs and beneath the endocardium, a slight excess of 

 serum in the serous sacs, a general pallor of the tissues, 

 and a tendency to congestion of the small bowels only 

 being present. Such cases supervene on severe exertion 

 and exposure. They obstinately resist varied forms of 

 treatment, and much light has yet to be thrown on their 

 nature. 



The system of the dog is specially liable to nutritive 

 changes. Thus fatty degenerations and tumours, as well 

 as a tendency to extreme obesity with age, are extremely 

 common, and has been noticed in spaniels, especially among 

 the different breeds. We shall see how the occurrence of 

 fatty degeneration of the heart and liver is frequent in toy 

 terriers and other pets. 



