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Why is my diabetic dog lethargic, not eating, and not improving?

Updated on September 23rd, 2025

Pet's info: Dog | Mixed Breed | Male | neutered | 8 years and 2 months old | 18 lbs

So I've contacted my vet several times on this and all he keeps saying is keep trying. My dog was just recently diagnosed with diabetes he is supposed to have 5 units of humalin n every 12 hours even if he doesn't eat. His eating is terrible I've even tried all sorts of human food and he turns it down but I know he's hungry even foods he used to love he won't bother with. He has no energy sleeps way more than he should just lays around all day still drinking a ton he's not getting any better

1 Answer

Most Helpful Answer

Jenny, DVM

Answered By Jenny, DVM

Veterinarian

Published on February 26th, 2018

It sounds like his diabetes is not controlled well. I would start with a glucose check and a urine test. This will confirm if the sugar is still high and if he has ketones in his urine. Ketones can make them sicker and feel bad. They usually require IV fluids and a different, strong but shorter acting insulin to help get it under control
they can also do blood work to check for cushings or a low thyroid or a secondary infection somewhere as these are common with diabetes and makes it harder to control diabetes until these are treated also.
Once the blood sugar stop fluctating and staying high, his appetite will come back and the drinking slow down.
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