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Hello, this is Dr. Jess. I am very sorry to hear about your dog Maverick.
I am concerned based on your description that your dog has vomited blood. Is there any chance he could have eaten something red in color?
If not, then the red color and metallic smell could indicate bleeding in the stomach or upper GI tract. The most common cause of this would be a bleeding stomach ulcer. This is a problem that we treat with prescription medication, so you will need to make an appointment with your vet to have your dog examined. If there is any chance that your dog could have ingested rodent bait/poison, then this is also a possibility for a cause of GI bleeding. If that is the case, I would recommend bringing your dog in right away for an exam and bloodwork.