How long do St. Bernards live St. Bernards generally live about 9-12 years. The length of a dog’s life span is related to many factors such as breed, gender, genetics, accidents, size, environment and conditions in which they live, disease, and exercise. In general, small dogs live longer than large dogs, mutts will live longer than purebred dogs, and dogs that live in a good environment and live scientifically will live longer than dogs that wander outdoors. The St. Bernard begins to step into its youth at the age of 1 year, and by the time the St. Bernard enters its 7th year, this means it has entered its senior years. From this point on, the St. Bernard’s body functions begin to decline until it finally dies.
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