) with my dog. I unlocked dog’s chain (I'd prefer, 'removed the leash' or even better 'unleashed him') so he 01del 00can02del 00 could roam freely (can I say, run around) and I was standing next to my car parked under a tree (personal preference 'standing under a tree next to my car'). I heard a voice as if something is cracking (I suggest 'heard a cracking sound' - your phrase sounds like it turned out it wasn't a crack but it was), very thin sound as if it 01del 00is coming02del 00 came from very far away place (doesn't sound natrual to me, maybe 'afar').
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