In 'Barney & Friends', what kind of creature is Barney?

In 'Rugrats', who is the bossy three-year-old cousin? In 'Arthur', what kind of animal is Arthur Read? In 'Doug', what is the name of Doug's dog? In 'Blue's Clues', what kind of animal is Blue? In 'Thomas & Friends', what kind of vehicle is Thomas? In 'Paw Patrol', what is the name of the boy who leads the pups? In 'Bluey', what breed of dog is Bluey? In 'Breaking Bad', what is the name of Walter White's DEA brother-in-law?