Why Is My Diabetic Maine Coon Drinking So Much Water and Refusing to Eat? (Vet Answered)

ℹ️Jeanette asks about their cat, Luna (Part maine coon)
🗓️Asked on 2 September 2026
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This question has been answered by a vet

Dr. Karyn Kanowski
Dr. Karyn Kanowski BVSc, MRCVS

Small Animal Veterinarian

Dr. Karyn is a small animal veterinarian originally from Australia, now based in the UK. She holds degrees in Veterinary Science (2010) and Zoology. When not helping pets, she tends to her 5 cats and garden!

The Question

It seems she doesn't want to eat much of his fancy food, cat food. But he does like a lot of the delectable squeeze ups. Now he is a diabetic and he's not eating near that much, but he's drinking a lot of water. And I don't know what to do.

Quick Info about Luna

Luna
CameraLuna's profile picture
Age: 4 years
Sex: Male
Neutered/Spayed: Yes
Breed: Part maine coon
Weight: 22 lbs
Location: Usa
Dr. Karyn Kanowski
Dr. Karyn replied on 3 September 2026

Dear Jeanette,

A cat that has been diagnosed as diabetic but is still drinking a lot of water, not eating well, and is lethargic is likely not yet on the right insulin dose. It can take some time to get the dosage right, and even then, adjustments are often needed over the course of their life. It's important that you don't increase the dose without first discussing it with your vet because too high a dose of insulin can cause seizures, coma, or even death.

I strongly recommend booking Luna for a check-up with your regular vet as soon as possible.

Do be aware that many cats need to have weekly visits until their condition is stable, and it may be worth talking to your vet about monitoring Luna's blood sugar at home using a glucometer.

Good luck,

Dr Karyn

Disclaimer: The advice provided here is for informational purposes only and does not constitute a medical diagnosis. Always consult your local vet for emergencies.
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