Firework medication, something to avoid or at least raise the discussion with your Vet(erinarian).
https://www.facebook.com/story.php/?id=100063632125372&story_fbid=1476237162424982
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Check out the latest publish study overview here about neutering. Bringing about the question more for other options than sterilisation as the golden standard.
This has always been our view and I'm happy to see that the results are now being published.