Merck Manual

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Manual ejaculation for collection of canine prostatic fluid
Manual ejaculation for collection of canine prostatic fluid
Manual ejaculation for collection of canine prostatic fluid

The best way to obtain a representative sample of prostatic fluid for cytology and culture is by manual ejaculation of the dog. This video illustrates the technique of manual ejaculation in a 3-year-old miniature Dachshund. 

Courtesy of Dr. Michelle Kutzler.