 The stones form in the urinary bladder in varying size and numbers secondary to infection, dietary influences, and genetics.Stones can form in any part of the urinary tract in dogs and cats, but unlike in humans, stones of the kidney are less common and do not often cause significant disease, although they can contribute to pyelonephritis and chronic kidney disease.Types of stones include struvite, calcium oxalate, urate, cystine, calcium phosphate, and silicate.