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My diabetic cat's blood sugar is 36 after insulin. Is this too low?

Updated On September 23rd, 2025

Pet's info: Cat | Domestic Shorthair | Male | neutered | 15 lbs

My cat has been diagnosed with diabetes. We have been giving him 1 unit in insulin every 12 hours per the vet orders. We were told to get a human glucose tester and test home 1 time a week as we regulate him. We tested tonight and he was at 63 fasting. We opted to not give him a shot before eating and tested about 45 mins after he ate and it was 36. Is this normal? Everything I have read says he should be between 60- 120..

1 Answer

Most Helpful Answer

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Answered By Laura Johnson VMD

Veterinarian

Published on July 13th, 2017

Hi, I'm Dr. Johnson. Thanks for using Petco Pet Education Center, formerly Petcoach! A blood sugar of 36 is too low. Do not give Gir insulin. Continue to feed him small meals and put some Karosyrup on his gums. Call your Veterinarian in the morning to discuss what they would like to change. Signs of low blood sugar are: salivating, crying, staggering, vomiting, increased respiratory rate, seizures, and or twitching. If you observe any of these things seek immediate veterinary care. I wish Gir the best!

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