beagle
Probably the bull mastiff
A dachshund is a pure breed, not a mix, and one of the oldest dog breeds there is.
The oldest breed of a beagle would be 46 years old
The oldest North American dog breed is believed to be the Alaskan Malamute, which is a breed that was developed by the native Inuit people in Alaska for sled pulling and hunting. It is a strong and resilient breed known for its ability to withstand harsh Arctic conditions.
The world's rarest dog breed is the New Guinea Singing Dog.
The oldest breed of domestic dog is believed to be a close relative to the greyhound and Pharaoh hound.
Afgnew Hound :)
The oldest dog breed in Asia is the Shar-pei. This was a fierce breed bred for hunting and guarding. The almost went extinct but due to a population surge in the US in the 1970's the breed has made a remarkable come back.
The Most Popular Breed of Dog is the Labrador Retriever.
The Affenpinscher is the second smallest breed of Dog.
There is not a specific dog breed that is smarter than any other dog breed in the world than there is in the USA, but the smartest dog breed are poodles.
the rare Mexican breed, the Xoloitzcuintle and the Chihuahua breed each live very long but im not sure which one lives the longest. soz