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Hello. Thanks for writing in. My name is***** and I would be happy to help you. It is very difficult to say if it was due to the insulin injection. If he had never had a reaction to it, it probably wasn't. If he didn't eat this morning, then I may be concerned about low blood sugar. In that case, rubbing some hone on his gums may help. But, I wouldn't do that if he did eat this morning. To be on the safe side, I would not give the insulin injection tonight, especially if he is not eating. I would see how he is tomorrow. If he continues to vomit a lot today, though, I would recommend getting him to another vet to get evaluated. Please let me know if you have any other questions or concerns. Hope this helps.
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