PNEUMONIA 25 



that condition will also be heard. At a later stage, 

 when the lung tissue is breaking down or resolu- 

 tion is taking place, tubular breathing gives way 

 to a sort of coarse crepitation to which the name 

 rri'pitatio redux has been given. This gradually 

 passes into the ordinary bronchitic rales. 



The sputum expectorated is of little diagnostic 

 value in the dog, as it is almost invariably swal- 

 lowed immediately it is coughed up. It is, however, 

 at first transparent, very viscid, and tinged with 

 blood, later it loses its sanguineous tint and be- 

 comes opaque and greenish, acquiring, in fact, a 

 mucopurulent character, and then gradually dimin- 

 ishes in quantity. In some cases, instead of 

 undergoing these changes, which may be regarded 

 as the normal changes, the sputum acquires a deep 

 purplish or reddish-brown tint, and at the same 

 time a more watery consistency. This form of 

 sputum has been likened to prune juice and is gen- 

 erally the sign not only of increased congestion 

 and escape of blood but of the onset of the third 

 stage. If attended by a disgusting fetor, it indi- 

 cates the onset of pulmonary gangrene. In either 

 case, it cannot but be regarded as an unfavorable 

 .symptom. 



Lobular {Catarrhal) Pneumonia 



This is the commonest pneumonia of the dog. 

 In typical cases the lung is studded with pneu- 

 monic patches varying in size from that of a pea 

 to that of a walnut, each involving one or more 

 pulmonary lobules, circumscribed by the interlobu- 

 lar connective tissue and separated from one an- 

 other by a network of still crepitant, and, it may be, 

 of perfectly healthy lung tissue. The pneumonic 

 patches may be in the hyperemic condition only, 

 in which case they may not be recognized or may 



