My mini jack started throwing up brown liquid late last night. Our chiweenie has been sick since last Friday but with diarrhea and has only threw up 2 or 3 times but looked to be like food the first few times and the last time was just yellow. My chiweenie seems to be feeling better (I have an appt at vet for her Thursday when I get paid, I have NOBODY to borrow from for before then) but now my other has started but with different symptoms. Could this be viral? Poison? I watch them like a hawk when they go outside. Should I do the water only diet for 24 to 48 hours or is the brown liquid something I need to take to ER vet?