Could my dog have suffered brain damage during routine dental cleaning and extraction?

I took her to the vet on Monday because she wouldn't eat Sunday night and she just laid around and wouldn't go out to go to the restroom or anything. He looked at her teeth and said that she had bad teeth and that an abscess was causing her problems. Then he checked her chart and noticed we had been in this past February (at that time he recommended we get her teeth taken care of soon) Any way after he looked at her chart he turned back and got really harsh and loud with me and said "We'll I told you back in Feb. that you needed to do her teeth and if you had done it then she probably wouldn't have this problem now!" She is 14 YO and they had done blood work to make sure that she could handle the anesthesia and we went ahead with the $518 procedure to extract 2 teeth and clean the rest. When I got her back they assured me sure was fine. She could no longer see or here. She could barely walk. couldn't get up from a lying down position and couldn't control her bladder. She's just not there. I took her back he he said " Oh, well that's neurological, but she'll improve." Well she died today while I was gone taking my son to the airport to return for duty. I don't know what to do. I am devastated. Di they make a horrible mistake and try to cover it up? Sorry about the long drawn out story. : (
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probably but you would need to have a forensics expert to prove it
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