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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. The Australian Cattle Dog is known for having one of the longest life expectancies.