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Quick Answer. Boxer dogs typically live for 11 to 14 years. This breed is susceptible to a number of genetic diseases that could potentially be fatal, including aortic stenosis and dilated cardiomyopathy. The risk of a boxer developing these health issues can be mitigated through the use of high breeding standards.
Dog Size. Research shows that larger dogs live for a shorter period of time when compared to smaller ones. For example, an Irish Wolfhound (average 115 lbs) has an average lifespan of 7 years, while a Jack Russell Terrier (average 15 lbs) can live up to 13-16 years.hihauhuas are normally referred to as the breed with the longest lifespan. They average 15-20 years and are one of the smallest dog breeds. The oldest Chihuahua on record 1, Megabyte, died at the age of 20 years and 265 days.