154 DISEASES OF THE URINARY AND SEXUAL APPARATV 



soon overcome and the catheter passes into the bladder without difficult 

 except in cases where the urethral opening is extremely small. 



It is only in exceptionally large animals that we have an oppoi 

 tunity to make an examination of the urethra. In the bitch ce: 

 tain discharges from the vagina are of diagnostic value. Durin 

 the period of "heat" (menstruation) we have a copious, blood 

 discharge, and during the preparatory stages of labor we see 

 thick, clammy discharge, aud the lochia commences with a nor 

 fetid, serous, slimy discharge, which soon changes to a thick, ye' 

 lowish fluid. Purulent, putrid, and bad-smelling discharges ai 

 generally found in inflammatory or ulcerative discharges from th 

 vagina or uterus. It may also be observed when a carcinoma i 

 present. In such cases it is best to introduce a mirror-specului 

 into the vagina and make a specular examination. 



Examination of the Prostate. 



This body varies in size, but in the dog it is large in compariso 

 to the relativci size in other animals. It is a round, ball-like bod 



Fig. 45. 



Section througli the pelvis of the male : 1, bladder ; 2, opening oi the ureters into th 

 bladder; 3, spermatic ducts; 4, prostate gland; 5, urethra, showing Wilson's muscle 

 6, arch of the urethra ; c, pelvis. 



cut into two portions, lying on the neck of tlie bladder where th 

 urethra commences. It lies about the anterior portion of the pubi 



