Your dog died in one of two ways. When the car hit your dog it broke the aorta lose from its heart. Instead of pumping blood throughout your dogs body, your heart pumped blood nowhere. Blood did not get to your dog's brain and your dog died. The second way your dog died was that when the car hit your dog, it broke a blood vessel in its brain. That shorted out some necessary circuits and its brain could not send a message to its heart to continue to beat. Without an autopsy, it is impossible to know the exact cause. The first thing to look for is the aorta. The second thing to look for is the brain.
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