Nammy Boy was nine years old, a large dog even by Dane standards. The Vet said it was normal for him to go suddenly. We knew that was a possibility when we rescued him eight years ago. The greatest pet we ever had, and the most mindful animal around children and especially careful around ladies. A great Dane's heart is very low in the chest cavity, and has to work much harder than a smaller pet, which gives them a much shorter life-span. If you are looking for a pet, I can't say enough about the Dane, They are Friends-For-Life. Nammy, you'll be missed.