my gysmo died suddenly... and ideas why?

My baby boy gysmo was only 4 years old. Perfect health we take him to the vet regular to check him over. Anyway I let him out side yesterdayas we always do. I thought something was wrong when he did not come back when I called him at 2:30 just 2 hours after been let out. At 7pm when he hadent come back I decided it was time to go looking.... half hour later I found him in the field behind my house in the bushes close to my garden. He looked like he had been attacked at first look but I brought him home and realised all the blood had come from inside his ear..... no cut at all like I first thought.... autopsy is out of the question I don't have those kind of funds.... but i just want to know what happened to my baby gysmo..., any help or ideas. I miss him so much

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