Although not explicitly mentioned, the Sheep are likely from the Suffolk breed due to their black head and legs.
In the second season, Bitzer (the sheep dog) had white fur on his belly and muzzle. He reverted to his tan colouring in the third season.
Is a spin off of Wallace and Gromit and has a spin-off called Timmy Time about Timmy. Shaun's first appearance was in A Close Shave.
Shirley's original working name was 'Big Fat' but this was thought to be too insulting for a children's program, so she was renamed after 'Big Daddy', a UK TV wrestler, whose real name was Shirley Crabtree.