Canine BPH in Clinical Practice: What Every Veterinarian Should Know

Benign Prostatic Hyperplasia (BPH) is one of the most frequently encountered prostatic conditions in intact male dogs, particularly with advancing age. Despite its high prevalence, it often remains underdiagnosed due to its largely asymptomatic nature. Studies indicate that nearly 95% of affected dogs may not show overt clinical signs, making clinical vigilance essential in routine practice¹. 

Understanding the Hormonal Basis of BPH 

The pathogenesis of BPH is primarily hormone-driven. The imbalance between testosterone and dihydrotestosterone (DHT) plays a central role. While testosterone levels decline with age, DHT levels increase, leading to prostatic enlargement. Metabolites such as 3α and 3β androstenediol further stimulate epithelial proliferation and hypertrophy^2,3. 

Additionally, increased DHT promotes the production of growth factors like VEGF, contributing to glandular hyperplasia⁴. Emerging evidence also suggests that prolactin may modulate prostatic growth, especially in aging dogs¹. For clinicians, this reinforces the importance of understanding endocrine influences when evaluating prostatic disease. 

Clinical Presentation: Recognizing Subtle Signs 

Although many cases are asymptomatic, when clinical signs do appear, they can be diverse and sometimes misleading. Common signs include¹: 

• Urethral discharge and hematuria 

• Tenesmus and constipation 

• Straining during urination and defecation 

• Tail held away from the body 

• Hind limb edema and gait abnormalities 

Interestingly, gastrointestinal signs such as ribbon-like feces are often due to rectal compression from an enlarged prostate. Subfertility and hemospermia may also occur even in the absence of systemic illness^1,5. 

Differentiating BPH from Other Prostatic Disorders 

A key clinical challenge is distinguishing BPH from other conditions like prostatitis or neoplasia. BPH typically presents as: 

• Symmetrical enlargement 

• Non-painful prostate 

• Normal consistency on palpation⁴ 

In contrast, prostatitis often shows urinary signs such as dysuria and systemic illness, while neoplasia is more commonly associated with weight loss and severe systemic symptoms^1,6. Recognizing these patterns can significantly improve diagnostic accuracy. 

Diagnostic Approach: Practical Clinical Strategy 

1. Digital Rectal Examination (DRE) 

DRE remains a simple, cost-effective first-line tool. In BPH, the prostate is usually: 

• Enlarged but symmetrical 

• Non-tender 

• Mobile with smooth margins⁵ 

However, limitations exist, especially in small breeds or when the prostate is positioned cranially¹. 

2. Ultrasonography 

Ultrasound is the most widely used imaging modality. Typical findings include: 

• Symmetrical enlargement 

• Heterogeneous echotexture 

• Presence of intraprostatic cysts^1,7 

While highly useful, ultrasound findings may overlap with other conditions, necessitating further confirmation⁸. 

3. CPSE Biomarker 

Canine Prostate-Specific Esterase (CPSE) is emerging as a valuable screening and diagnostic tool. Elevated CPSE levels correlate with prostatic disorders and can help in early detection—even in asymptomatic dogs¹. 

Combining CPSE with ultrasound significantly enhances diagnostic accuracy while reducing reliance on invasive techniques¹. 

Why Early Diagnosis Matters 

Early identification of BPH is not just about symptom control, it also helps prevent complications such as: 

• Severe constipation 

• Perineal hernia 

• Progressive fertility issues 

Given that prostate size does not always correlate with symptom severity, proactive screening in middle-aged intact males is recommended⁸. 

Clinical Takeaways 

• BPH is highly prevalent but often silent 

• Hormonal imbalance (↑DHT) is the key driver 

• Clinical signs are variable and often nonspecific 

• Combine DRE, ultrasound, and CPSE for best results 

• Always rule out prostatitis and neoplasia before treatment 

Conclusion 

BPH should be considered a routine differential diagnosis in aging intact male dogs. A structured diagnostic approach, combining clinical examination with modern tools like CPSE, can significantly improve early detection and management. For veterinarians, the goal is not just diagnosis, but timely intervention that preserves quality of life and, where needed, fertility. 

References 

1. Derakhshandeh N, Mogheiseh A, Nazifi S. Diagnosis and Treatment of Benign Prostatic Hyperplasia in Dogs: New Approaches. Veterinary medicine international. 2025;2025(1):4153172. https://onlinelibrary.wiley.com/doi/pdf/10.1155/vmi/4153172 

2. B. Yuan, F. Duan, J. L. Zhang, H. Zhang, and M. Q. Wang, “Establishment of Hormone-Induced Canine Benign Prostatic Hyperplasia Model: A Prospective, Controlled Study,” Heliyon 8, no. 11 (2022): e11352. https://www.cell.com/heliyon/pdf/S2405-8440(22)02640-8.pdf 

3. A. Adel and M. khadidja, “Canine Prostatic Disorders,” Open Veterinary Journal 2, no. 3 (2017): 83–90. https://openventio.us/index.php/VM/article/download/637/571 

4. D. S. Angrimani, M. M. Brito, B. R. Rui, M. Nichi, and C. I. Vannucchi, “Reproductive and Endocrinological Efects of Benign Prostatic Hyperplasia and Finasteride Terapy in Dogs,” Scientifc Reports 10, no. 1 (2020). https://www.nature.com/articles/s41598-020-71691-7.pdf 

5. M. R. Das, R. C. Patra, R. K. Das, P. K. Rath, and B. P. Mishra, “Hemato-Biochemical Alterations and Urinalysis in Dogs Sufering From Benign Prostatic Hyperplasia,” Veterinary World 10, no. 3 (2017): 331–335. https://pmc.ncbi.nlm.nih.gov/articles/PMC5387661/pdf/VetWorld-10-331.pdf 

6. G. Cazzuli, G. Suarez, S. Busconi, J. P. Dami ´ an, and P. Pessina, ´ “Clinical Signs Associated With Prostatic Disorders in Canines: Retrospective Study in Uruguay (2011–2019),” Open Veterinary Journal 13, no. 10 (2023). https://www.ajol.info/index.php/ovj/article/download/259402/244946 

7. W. Niza˙ nski, M. Ochota, C. Fontaine, and J. Pasikowska, “B- ´ Mode and Doppler Ultrasonographic Findings of Prostate Gland and Testes in Dogs Receiving Deslorelin Acetate or Osaterone Acetate,” Animals 10, no. 12 (2020): 2379. https://www.mdpi.com/2076-2615/10/12/2379 

8. T. Laurusevicius, J. ˇ Siug ˇ zdait ˇ e, N. Juod ˙ ziukynien ˇ e, et al., ˙ “Comparative Evaluation of Diagnostic Methods for Subclinical Benign Prostatic Hyperplasia in Intact Breeding Male Dogs,” Animals 14, no. 8 (2024). https://www.mdpi.com/2076-2615/14/8/1204