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Some dogs do live longer than others. Generally, a dog's lifespan is directly related to the dog's size. Smaller toy breeds tend to have longer lifespans than larger breeds.
A toy breed like a Lhasa Apso can live 12 to 14 years and Chihuahuas can live 15-20 years or so given a healthy nutritional diet and proper vet care. A very large breed like the Irish Wolfhound or Great Dane may only live 5 to 7 years. To prolong any dog's lifespan, make sure your dog eats a nutritious, well-balanced diet, receives plenty of exercise, prompt medical attention and trained properly to live a long, healthy and safe life!