The most likely cause is that he/she has eaten something that's upset their stomach and the vomiting will pass within 24 hours or so ,. Colors are tricolor (black, tan and white) or white and red. There are particular challenges in buying a new adult dog (compared to bringing home a new puppy). https://dev.to/tellerbath8/taking-care-of-your-elderly-pooch-the-comprehensive-nutrition-guide-4gk0