Hematuria in Bichon Frize may be caused by urinary tract infection, cystitis and other reasons. After the owner finds out, he should send the dog to the pet hospital for examination and treatment in time. You should pay attention to your dog's diet and hygiene, and feed your dog some light and easy-to-digest food to promote gastrointestinal digestion. During this period, you can put your dog in safety pants to reduce the risk of infection.