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Why is my diabetic dog vomiting and falling after starting insulin?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Small (up to 22lb) | Female | 12 years and 11 months old | 14 lbs

Our dog recently was diagnosed with diabetes. Since we started her insulin she's been worse. We are feeding her baby food through a syringe due to the fact she won't eat and the Dr says she will die without her insulin. She is vomiting and fall when she walks. She also quit drinking water today. We can't get to the vet any suggestions and thoughts on what is causing this would b deeply appreciated. Please help. Thank you

1 Answer

Most Helpful Answer

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Answered By Makenzie Kurth, DVM

Veterinarian

Published on May 15th, 2018

I am so sorry to hear about Pepper. This is a sort of in-depth discussion that might work best as a consultation if you need more guidance. There should be a link below or you can go to the doctor page and request a consultation with me (or any doctor you wish). My first thought is making sure Pepper was correctly diagnosed so seeing some bloodwork/urine results would be very helpful. If this were the case the insulin itself could be making her very sick and weak. This is a life-threatening emergency. My next thought is that she was correctly diagnosed but she has some secondary complication- namely diabetic keto-acidosis. This is a life-threatening complication of unregulated diabetes which causes vomiting, dehydration, lethargy and can even progress to shock and death. Either way, I am extremely concerned and would STRONGLY recommend you visit the emergency vet IMMEDIATELY. Pepper could absolutely die in the next 48 hours depending on what is going on. If you absolutely cannot get to a vet I encourage a consultation as we may be able to ask some better questions and walk you through some steps to help figure out what’s going on. Best of luck to you and Pepper.

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