Hematuria in male dogs may be caused by urethritis, cystitis, urinary stones, bladder stones, improper diet, estrus, or trauma. It is best to take the dog to the pet hospital to check the cause first, and then carry out targeted treatment. treatment to avoid delaying the condition. You should pay attention to your dog's diet, let your dog drink more water, and pay attention to the hygiene of your dog's reproductive organs, especially when your dog is in estrus.