I am so sorry to read about Mystic, he is too young for this to be happening.
I used to work in a hospital so I am very familar with the medications needed in humans to prevent blood clots. I don't know what medications the vet is giving Mystic (and she might already be doing this), but there is something that MIGHT help him. It is call "low molecule weight heparin". This is something that will ONLY be available through your local hospital but she can order it and they should be able to provide it.
Here are a couple of references if she needs some supporting documentation:
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC2666318/
http://www.sciencedirect.com/science...90023311002954
If she would like a copy the articles please let me know and I am happy to email them to her.
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