Three weeks ago my ten year old dog died suddenly. She had not been sick at all. That morning she ate as usual, and was her normal energetic self. We went out for a potty break and she fell over, got up staggered and went down again. She lived for maybe thirty minutes during which time she frothed at the mouth, turned blue, tried several times to get up then just slipped away. She was a big dog and I couldn't pick her up to get her in the car. By the time help came it was too late. Does anyone have an idea what it could have been? She was not overweight. She ate the best food and lived in the house. Not that it matters, but I'd really like to know what happened. I was too freaked out to think about a post mortem exam so I missed the boat on that one.