The dog`s breed tendency who are get sick the most with urocystitis is analyzed. It have been identified that dogs with diagnosed cystitis have subfebrile fever, moderate tachycardia and tachypnea anxiety when urging for urination, strangury, polakuria, involuntary excretion of muddy urine, and some of them were diagnosed with an increase in volume and pain of the prostate gland. There are significant changes in the morphological blood composition were found in dog's blood, namely low erythrocyte count and low hemoglobin content, and significantly higher leukocyte count, neutrophilia with bands growth and the appearance of young neutrophils compared to healthy animals. In the serum of dogs suffering from urocystitis was revealed a moderate increase in protein due to the increase globulin fraction, increased activity of ALT, AsAT, ALP and decrease of the total calcium and inorganic phosphorus content. A sharp increase in hydrogen index, turbidity, sometimes impurity mucus and a sharp odor of ammonia, protein urobilinogen, bilirubin, nitrites, the appearance of a large amount of sediment in the form of a clot of pus and mucus have been revealed in dogs urine with urinary cystitis.