That, and periodic testing, are the way your veterinarian becomes aware of secondary health problems that occur down the road. (2ndchance.info)
If diabetes progresses without being treated, dogs can develop secondary health problems like cataracts and severe urinary tract problems. (pets.webmd.com)
If a diabetic dog is not treated, he can develop secondary health problems like cataracts and severe urinary tract problems. (aspca.org)