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Hello, JACustomer. I have been a Veterinary Nurse for over 15 years and would be happy to help you today. I'm reviewing your question right now.
The shot was likely for nausea and to reduce the instance of vomiting. How can I best help you today since the vomiting appears to have stopped?
There can be a variety of causes for pigmentation of vomit. Typically the digestive fluids in the stomach are to blame, mixed with ingesta (contents of the stomach) which may be influenced by food, dirt, etc. that a dog has consumed. Sometimes blood is also the source of pigmentation though it usually takes on a red appearance.
Keep me posted if you need more help.