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Hi. My name is***** I'm very, very sorry to hear about this sudden loss of Magneto. It is absolutely hard to loose one and not know why. I'm going to be honest here and based on the clinical signs with the bleeding from ear, nose and mouth that suddenly makes me think of external trauma. I know the vet didn't see any signs of external injuries, but if something very heavy landed on his head / hit him on the head, this could cause all this and not necessarily cause outward signs. Could the dog have done this? I hate to say this, but that is on the rule out list. I've seen kittens injured in very similar ways from the resident dog being aggressive around food. I don't feel that this was a poisoning.
It is hard to think that such a thing could happen, but again, everything just seems to point towards trauma and if nothing was knocked over or there are no other possible parties, then the dog would again have to be a high suspicion. This is something that can happen. I honestly see something similar at my ER where it is the resident dog being aggressive with a new puppy over a food or a treat. My condolences go out to you and your family.