Are you 100% it was blood? Did you take it in and have them gauaic test it? I'm sure if you thought it was blood, it was, but to be totally fine now, just ruling out it
not being blood.
Otherwise, I don't know what to say. I am in the medical profession for
humans and am thinking of ulcers, and other types of GI issues that would cause vomiting of blood, but dogs are sooo different.
I don't know, I really wish I could give you an answer. I hope everything is better and the pooch is feeling 100%