It is reported the case of a dog with strangury, increased bladder volume and presence of a painless mass in the region of penis bone. The failure of urethral probing allowed the diagnosis of urinary obstruction. A regular contour mass, moving and obstructing the urethra, was observed in the radiographic examination. After surgical removal, the tissue was submitted to histopathologic analysis, which confirmed the diagnosis of aneurismal cyst of the penis - yet unreported disease in dogs.
strangury; urethra; canine