How did my 4 year old healthy English Bulldog die after a having a Reproductive l Hyperplasia Surgery?

First of all I want to say that I am devastated by the death of my dog. She was the sweetest and loving dog anyone could ever ask for. I can't believe that she died over something that we choose to have done. This is a common problem english bulldogs have and we managed to hold off for 4 years without having the surgery. All along we have been told this was a very routine surgery where they cut the extra skin around her and sort of tighten it up a bit. She was starting to get a UTI and the vet said if we did not get the surgery it would just keep coming back and could then become a real health concern for our dog Bree. My boyfriend went on the consultation and the vet NEVER said one thing about the dangers of this surgery. I know it sounds odd but he really didn't. He told my boyfriend that it was a very simple surgery and we had nothing to worry about. The consulation was VERY short, so short my boyfriend almost left without paying. He thought it was added in the cost of the surgery and the visit was so short he didn't think he would be getting charge. They charged us $120 for that consulation and NEVER even took the time to explain the dangers especially with having this done on a bulldog. We got the call at around 4pm she was in recovery that the surgery was fine, all went well, she is awake and they have an ice pack on the area. I am still at work at this point. My boyfriend calls me back at 7:45pm to tell me to GET HOME right away,but doesn't say why just something has happened. I speed home to find out that the vet on duty called him to say she went into cardiac arrest can they do whatever is necessary. He said YES please! The same vet calls back 6 mintues later to say she died. I AM BLOWN AWAY! How did this happen? We went there and the vet on staff who was the one to call that said she died, started off by saying how bulldogs have restricted air waves and when you put them under it slows down the breathing and the heart rate. With this, I asked her why did they not monitor her better, why was Bree not on a machine that would have warned them she was dying, why was she just treated like any other breed of dog when they knew the risks. The vet without coming right out and saying YES we screwed up, just agreed with me and kept saying she was so sorry that she doesn't know how this happened. I told her they killed my dog, she never gave me any explanation or try to talk her way out of it and say...well no, we did this,this,this. She agreed with me and I knew that my thoughts were correct. I asked for a copy of my records, a detail description of what took place during and after the surgery, who was working on staff, how many beds are back in recovery room for the staff to look after all at once,etc. She said "okay". She then came back to say she couldn't that she called the vet that performed the surgery and he told her not to do anything that they would prepare something for us tomorrow. I then replied, so that you guys can cover your tracks? She didn't answer me. How likely is it that I am going to get a REAL account of the details surrounding the death of my dog? I'm probably not. I am so discussed, so heart broken, so empty inside, I can't believe this happened to my dog. I know there are risks with any surgery but WHY didn't they come out and say "you have a bulldog here are some the of the problems that may arise from this surgery, this is what we are going to do to make sure that nothing happens to her, but we have to warn you" had they said THAT or anything remotely close to that, we would have thought twice about it and did our own research, picked a vet that specialized in bulldogs or waited like we had done for this long and seen if she got another UTI. I really feel, it was not anything they did during surgery (or atleast I hope not) but the after care is where they dropped the ball and which ultimately killed my best friend. Who knows how long Bree was back there suffering or even just dead. Who knows! I wonder if she wasn't really already dead when they called. The vet said she was not breathing when they found her and that her heart had already stopped. Our lives will never be the same! This dog brought so much joy in our lives I can not believe it. How could one little animal bring me so much joy! I will truely miss her and just want nothing more than her to be right next to me. I have to go today and have her remains taken care of. I will never forget what this dog has done for me! I will miss her!