This study reports the clinical, ultrasonographic and bacteriological findings from dog with chronic prostatitis (CP). A Berger de l’Atlas dog ten years old, suffering from a urinary problem was presented to the canine clinical pathology of Tiaret veterinary science Institute for consultation. The digital rectal examination (DRE) was the first diagnostic test used for CP screening. The classic ellipsoid formula was adequate for determining the prostate volume. Clinical examination of the prostate based on rectal palpation and ultrasound detected prostatic hypertrophy with no signs of pain. Urine and prostatic fluid aspirated under ultrasound guidance are clouding.