Human: My dog is having trouble urinating. What are the signs that he has a urinary tract infection? Assistant: 
Common symptoms of a urinary tract infection include increased frequency of urination, pain or burning during urination, cloudy or bloody urine, and strong smelling urine. Other symptoms may include fever, chills, nausea, vomiting, fatigue, and back pain. If your dog exhibits any of these symptoms, it's important to take him to the vet for an exam.