My boyfriend and I rescued an 8 month old Shepherd/Husky mix. She was a beautiful, healthy dog and was up to date with all her shots and vaccinations. She was a friendly, loyal pup and there was nothing really wrong with her besides on occasion she would have diarrhea, which we took her to the vet for and she got medicine. She just had a sensitive stomach if she ate any other food but her own. So today we got up and she was fine, acting normal as ever. Then we were laying down in bed watching t.v and Koda wasn't doing anything out of the ordinary, until she suddenly threw her head back into my arms, stiffly, and she started moaning/yelping for about 15-20 sec. then she suddenly stopped breathing. No foam at the mouth, no drooling, no shaking, nothing. My boyfriend and I were freaking out and didn't know what to do. So we tried CPR as best we could then threw her in the car and flew to out vet. But, it was sunday and unfortunately all the nearby vet clinic's were closed! So we had to drive about 25min. away to the nearest animal emergency hospital. But when we got there they couldn't revive her and it was too late. It was probably the worst day in my life. It was so unexpected and sudden we were shocked and devastated because she showed no signs and nothing was wrong. Dr.'s suspected a heart attack, or some kind of heart problem but she was only 8 months old! How and Why could this have happened?? I know before we rescued her she was getting neutered and the Dr.'s gave her too much anesthesia and she actually died and they had to revive her. The Dr.s said there wasn't anything seriously wrong with her heart after and never said to be careful or keep an eye out, and we wondered if that could have been a major problem also? We are just so shocked and confused as to why this has happened and just want to know what could have been the problem.