Polycystic kidney disease (PKD) is an inherited autosomal dominant disease identified in Persian and Persian related cats. Ultrasonography is an accurate and accessible method for detecting PKD and other urinary tract disease. It is an initially survey study of PKD and other urinary tract abnormalities using ultrasonography in Persian and other long hair cats in Iran. This study was conducted on 83 cats including 68 Persian cats and 15 Persian related cats between December 2013 and March 2015. The age of cats was between 3 to 72 months. Cats were classified as PKD-positive when at least one renal cyst was observed. Association of variables with PKD and other urinary tract disease detected by ultrasonography was analyzed. The prevalence of PKD among Persian cats and in total population was 33.8 % and 31.3%, respectively. PKD was more prevalent among male cats (P=0.045, OR=2.68). PKD occurrence was significantly more among cats fed by commercial dry foods compared to those fed by homemade foods (P=0.036, OR=14.05). There was no significant association between PKD and age, hair color, eye color, related clinical signs and other ultrasonographic findings. The prevalence of renal calculi, urine sediments and bladder calculus were 2.4 %, 32.8 % and 3.6 %, respectively. Urine sediments were significantly more detectable with increasing the age (P=0.004). Despite the relatively high PKD prevalence in this study but it is lower than other countries. On-time diagnosis of the disease is essential for screening program and to eradicate the disease or to plan therapeutic management.

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