How long do big dogs survive?

The average lifespan of a big dog, defined as dogs weighing over 50 pounds, is usually around 8-13 years. However, this span can vary substantially among big dog breeds. Generally, bigger dog breeds might have shorter lifespans than smaller varieties due to factors such as rapid growth rates and predisposition to genetic health issues. It's always best to talk to a veterinarian or look up information specific to the chosen breed to assess individual longevity expectations.