Relax....just thoughts that went through my mind. Most normal pet owners don't put a bullet in a dogs head and toss it in a lake for disposal. Perhaps it got into rat poison or antifreeze and sought out water like a wounded deer does? Perhaps it got caught in the cross fire and the wind blew it down a hill and into the lake? Maybe an eagle dropped it? Suicide??
Yes, I'm being sarcastic....I haven't made up my mind about anything, just shared the first couple thoughts that ran through my head, were those thoughts negative? YEP!