Lower urinary tract disease (LUTD) refers to a group of disorders that commonly leads to irritation of the urinary tract and corresponding undesirable clinical signs. In dogs, bacterial infections of the urinary tract and the presence of stones in are the most common causes of LUTD. In cats, the most common cause of LUTD is idiopathic cystitis. Urinary diseases commonly require medical treatments such as antibiotics or surgeries. A therapeutic diet can be an important aid in managing these diseases and their recurrence.