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It’s difficult to define the point at which a dog can be classified as “senior” since there is a wide variation in the life expectancy of different breeds
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Generally, medium- and small- breed dogs tend to live the longest, even up to 17 or 18 years
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Giant breeds tend to have a much shorter life expectancy, often only living for 7 or 8 years
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As a dog ages, there is a tendency for lean tissue to decrease while body fat usually increases
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Exercise can help maintain a healthy body weight and delay deterioration of senior dog joints