According to Rocky Mountain Great Dane Rescue, a Great Dane, on average, lives between seven and 10 years. However, some live until age 13 or 14.
While the average life expectancy of the Great Dane is seven to 10 years, this figure is based on a healthy dog. Great Danes, according to Dog Breed Info Center, are prone to a number of health conditions, including hip dysplasia, heart disease, bloat and mast cell tumors. If a Great Dane contracts one or more of these conditions, this can shorten the life span significantly. While Great Danes are relatively inactive indoors, Dog Breed Info Center highlights the importance of adequate exercise, including at least one long daily walk, to keep the dog healthy and to maximize its life span.