Their skin and coat will lose their shine 

Sadly, animals that suffer from diabetes will have a dull and poor coat and the quality of their skin will decrease. This phenomenon occurs when their body can’t get enough nutrients, vitamins and minerals that are essential for their health, due to other symptoms of diabetes. 

 “When the body is not getting the nutrition it needs because insulin isn’t working, and a dog is becoming chronically dehydrated from the increased water loss in the urine, their haircoat will often start to lose its luster and thin out, and dogs will start to have dandruff and dry, scaly skin,” says Dr. Romine.

But, insulin therapy is beneficial for them, because “there is now enough energy and nutrition to put towards healthy fur, and not just maintaining critical organ function,” Dr. Romine.