Causes of Sudden Death in DogsI come home for lunch everyday to feed my dogs and check on them. Thursday, everything was normal. Both of my baby dogs were acting normal. I fed them and gave them a treat like I alway do before I leave. I came home after work and found my 6 year old Yorkie dead/cold dead. She was 14 lbs and bit overweight, but she was healthy, active, and playful.