Australian Cattle Dog
The current longest-living dog in Guinness record is hold by an Australian cattle dog named Bluey who lived for 29 years. As a typical working breed, Australian cattle dogs are energetic, intelligent and respond well to training. Also, they form a strong attachment with their owners.
Chihuahuas live an average of 15 to 20 years. The longest living Chihuahua recorded is a 20 years old Chihuahua called ‘megabyte’. Some people said that they can live long largely because they are not prone to any serious illness
Beagles in real life are smart, lovable, gentle and friendly dogs. Like most medium-sized dogs, Beagles usually live at least 12 years. The oldest known Beagle was named Butch, who lived in Virginia and died at the ripe old age of 27 in 2009.
All poodles and poodle mix have a relatively long lifespan. Toy poodles have the longest expected lifespans among the group. A toy poodle can live 14 to 18 years under good care. Just like other poodles, toy poodles are easy to train and intelligent. The oldest living Toy Poodle was Seamus, who lived to be 20-years-old.
For a medium-sized breed, the Shiba Inu has a long lifespan, reaching 16 years or older. These dogs tend to be very strong-willed and aloof, so they're not for everyone. But they are a clean, quiet, and loyal breed. Pusuke, the Shiba Mix was certified by Guinness World Records as the world’s oldest living dog in 2010. He was 26 when he passed away in Japan.