Our Coton that was 6 years old passed yesterday. He was excited when our son came over and had a massive heart attack. My wife is devastated. That was the smartest and best dog we ever had. He better be at Rainbow Bridge to meet us. I have had to put many down that were old and sick but this one was a shocker. The vet told us he had a slight heart murmer but so have some of our other dogs. We figured he would live to be 14 or so based on his breed.