Bitzer the mongrel - consisting of "bits of this, bits of that" - was made yellow to give a good contrast to the sheep.
"Some of the characters are easier to animate than others, and Bitzer has never been popular," says Chris.
"He has to do a lot of physical things but isn't really the right shape to do them. He is made a silicone too and splits quite a lot!"
Bitzer tries to keep the sheep in line, but even he can't help but get involved in some of Shaun's antics