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My dog died suddenly. What caused her panting, bleeding, and collapse?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed | Female | spayed | 40 lbs

my dog recently died a sudden death. I was wondering if there was a way to give you her symptoms to see if we could narrow down what might have been the cause? She was panting, having trouble breathing, coughing, she seemed dizzy/out of it and she was bleeding from her vagina. She was spayed and was very healthy her entire life. She was running and eating that morning and within 30 minutes of me finding her panting...she passed away. She was almost 9 years old.

1 Answer

Most Helpful Answer

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Answered By Dr. Melanie, BVSc MS

Veterinarian

Published on October 17th, 2019

Again, I'm sorry you lost Honey suddenly. One thing that comes to mind to me is a splenic hemangiosarcoma (tumor on the spleen). The dog acts completely normal while this tumor is growing (or shows only very subtle signs of illness), and then suddenly crashes and dies when the tumor ruptures (which they do). It appears to come out of nowhere. This happened to my dog. He seemed completely fine, then one night out of nowhere, he was panting and having trouble breathing. I rushed him into the clinic, and he had a stomach full of fluid. There was nothing I could at that point in time. Another option is she got into something toxic. I wish I could give an exact answer, but without seeing her in person, I can't say for certain, but I hope this helps.

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