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Why is my diabetic dog's blood sugar high? Could it be Cushing's?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Small (up to 22lb) | Female | spayed | 14 years and 2 months old

Hi I have 11 year o!d mixed breed male dog who is diabetic and on insulin for the last three years but recently we can not get his blood sugar to come down then goes into DKA our vet has now mentioned Cushing's disease suggesting this. could be causing high blood sugars they say if this is the case it may be kinder to put him to sleep

1 Answer

Most Helpful Answer

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Answered By Megan, DVM, CVA

Veterinarian

Published on October 9th, 2017

This could be a possibility. If your vet thinks Cushing she could be complicating her diabetes, you could consider testing her for cushings. If she definitely has cushings then you can start treating her for that. In the meantime, y'all will need to work on getting her diabetes under control. Another option would be to see if there is a specialist (internist) near you that could take over her case to help you get the DKA under control while also diagnosing and treating for cushings if needed. The main difference between a specialist and a general practitioner is that the specialist specializes in these complicated metabolic diseases and usually have facilities and specialized equipment that can care for them 24 hours if needed. If there is a cost concern and yall are unable to get the DKA under control and she is continuing to decline then yes, I would consider euthanasia. Unfortunately, even with intensive care and extensive testing, sometimes these guys don't improve and continue to decline no matter what we do. I know this is a difficult time and decision. Just know that you are doing the best thing for her whatever you decide. I hope this helps and know we are thinking of you. Hugs!

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