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Hello,Thank you for using Just Answer. My name is***** am a veterinarian and will do my best to help.
I am sorry to hear you are worried about TJ.
How much insulin is he taking?
How long has he been diabetic?
When vomit is black, there is concern for internal bleeding; digested blood cells appear black in color, like coffee grounds. He may just have eaten something black, however, and threw it back up.
If you look at his gums, are they pale in color or a normal bright pink?
How is TJ doing? I have not heard back from you; I hope you saw my response.