I would say german shepard
The most popular breed used as guide dogs is the Labrador Retriever.
The Chihuahua is the most popular breed of toy dogs. The second most popular toy dog breed is the teacup yorkie.
bulldog
Huskies
Corgi
labrator retriver
the most popular dog breed in Europe is goldenretrever
Every Dog is popular one breed is adopted by thousands of people
Dalmatians are a popular breed, and not at all endangered.
Guide Dogs walk with their owners/handlers. Being a dog they can run very fast, but this skill is not used for guide dogs.
On the dog show, the Beagle 'Aro' was the symbol to the most popular breed in 2007, as well in 2008.
guide dogs don't train their puppies or the puppies being trained to be guide dogs but professional dog trainers do