Veterinarians can’t diagnose over the phone. Besides being unethical and illegal, diagnosing by phone doesn’t allow veterinarians to physically examine a pet. A physical exam is necessary so your veterinarian can provide an accurate diagnosis and proper treatment. Treating a pet for the wrong disease or condition will cost more in the end and could be harmful or even deadly to your pet. Therefor is it crucial for the veterinarian to perform a thorough physical examination.