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Hello I am Dr. Joey. Thanks for asking your question and trusting me to help you and your pet today. I am a licensed veterinarian with over 18 years of experience. I was so sad reading your story. I can understand how this would bother you still months later.
Unfortunately to truly know she would have needed a necropsy (autopsy) but that is not possible. All we can do is guess. To link the hind end issue, crying out and the epistaxis (nose bleed) would make cancer or a tumor that metastasized (or affected the bone marrow) most likely. With lab work we would have ruled out a liver issue which can cause bleeding problems. Another possibility is heart issues without an overt murmur, which can lead to disseminated blood clots, high blood pressure and the signs that were seen.