Transitional cell carcinoma(TCC) was identified by cytological and ultrasonographic findings in an 11-year-old, intact female Yorkshire terrier with intermittent hematuria for three years. In color-doppler ultrasound images there was marked irregular wall thickness of the bladder surface and well-defined hyperechoic focal lesions within the mass. Active vascular response was observed in the surroundings of hyperechoic lesions.