my beagle has been taking doxycycline for a week for anaplasmosis nd now is throwing up blood.?

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is throwing up blood. is this part of it will it go away or is the antibiotic not working?
Hematemesis is always bad. If it's just slightly blood streaked, probably not a major issue, but if she is vomiting lots of bright red blood, this is an emergency. You need to get her to the vet immediately.  (+ info)