999: Killer On The Line (2016)

S1E34 Helping Hound

The Farmer is unsettled when an adorable mouse shows up in the farmhouse, prompting him to instruct Pidsley the cat to get rid of the intruder. However, when the mouse seeks safety within Shaun's fleece, the rest of the flock convinces Shaun to safeguard their newfound companion from the relentless cat.