From Vetcentric,Is Your Dog’s Prostate Making Him Prostrate? There's a lot of additional useful information in this article.Diagnosis of prostatic disease and discrimination between benign processes, prostatic infection, and cancer, may require a series of diagnostic tests. A complete blood count and urinalysis and x-rays may be the most helpful screening tests. Ultrasounds of the prostate and specialized dye studies offer useful information about the architecture of the prostate that may help to predict the severity of the disease. Bacterial cultures and analysis of prostatic fluid collected by ejaculation or prostatic wash procedures may reveal specifically the presence of bacteria and inflammatory cells to verify primary or secondary infection. Occasionally, tumor cells are recovered in this way. Urine cultures are frequently collected as well.