I have just got back from a walk with my dog, during which he vomited large amounts of bright red blood. He continued his walk as normal aftewards but has not been himself for a few days and has been vomiting (no blood) for a few days.
There is a good chance it is an ulcer due to long term anti-inflammatory use.
My question is, do I need to get him vetinary attention today or will it wait til tomorrow?