The good old days have a way of focusing in on things that really weren't the norm
"" Despite the differences between cats and dogs, both pets are living longer than ever before. Dog life expectancy has doubled in the past 4 decades, and housecats now live twice as long as their feral counterparts. The reasons can largely be chalked up to better health care and better diet. "" (one big part of health care for cats, dogs and even horses and cattle, is parasite control.
http://www.sciencemag.org/news/2015/12/feature-dog-lives-300-years-solving-mysteries-aging-our-pets
. Dogs like Chanel and Max and cats like Granpa Rexs Allen are outside the norm, but they may be trailing indicators of an increasingly long pet lifespan. Veterinarians say it’s not unusual for some dogs and cats to reach 15 years or more, and they’re seeing more and more pets do so.
Just as the average life expectancy for people keeps reaching closer to the century mark, we’ll continue to see the same parallels in our pet population,” says Martha Smith, director of veterinary services at Boston’s Animal Rescue League.<
http://www.nbcnews.com/id/33076736/ns/health-pet_health/t/life-dog-years-many-pets-living-longer/
There are some anti-breeder articles claiming purebred dogs are living shorter lives, and spay/neutered live longer. Considering a high cause of early deaths with unneutered, obviously irresponsible ownership, not possessing reproduction ability is a big factor.