I can't tell you how many times Geena did that to us.... She'd be perking right along & then start vomiting blood. First 10 to 15 times, we headed to the vet in a panic... By the time we lost her to something completely unrelated (squamous cell carcinoma), we were only taking her in for it if it continued more than 2 or 3 days or she acted sick in other ways.