PRINCIPLES OF VETERINARY SURGERY 



549 



may become indurated and an obstinate constipation i-e- 

 suits that will provoke colic every day, and necessitates the 

 extraction of the fecal matter. When the coprostasis is 

 neglected the rectum dilates, finally ruptures and causes 

 death (Fig. 69). The female cannot fecundate and the 

 passage of urine is more or less obstructed. The melanotic 

 tumor may invade the foreskin and prevent protraction of 

 the penis^ cause retention of urine, incontinence and intense 



Fig. 68. 

 Cutaneous Melanosis (Cadeac) . 



irritation of the prepuce. Those at the extremity of the 

 tail constantly become bruised, mutilated and ulcerated, 

 and become the seat of a blackish fetid suppuration. They 

 may, on the other hand, encroach on the sacrum, and the 

 other bones of the pelvis, or to the terminal extremity of 

 the .spinal cord or the region of the coxo-femoral articula- 

 tion, and provoke lameness. 



In the parotid region they fill up -the parotid cavity, 

 emboss the region and may even cause roaring. When the 



