If it was me I would have been rather more curious to find out what I had hit. Given there was a dog in the middle of the road your wife must surely have realized she might have run over it. I would immediately check with the owner, offer to take the dog for checking/treatment, and offer compensation. Not to do so, and even worse adopting a combative attitude, could yet land you in big trouble here. I hope the dog is ok for all concerned.