If someone ran over a dog could they die if they neck breaks

cause i mean my dad ran over over one broke its neck and it didnt move but he said he went back to look at it he said it was gone

it depends on which part he ran over. dogs are said to be of high strength, any action of inadequate pressure or power would not necessarily be fatal. if the right amount of energy is used at the right spot, for example an artery running through the neck (like the carotid artery) or something. but since the dog apparently vanished, we could make out that it is not exactly dead