Mirror, Mirror II S01 E16 Mandy's Dog

Mandy is miserable when it seems everybody has forgotten her birthday. Until the family turns on a surprise party and a surprise present: Victor, a golden retriever pup. Meanwhile Fergus is camping in a totara tree to prevent the neighbouring farmer felling it. But when Victor savages a sheep, the farmer resolves both to shoot the dog and get the two-legged nuisance out of the tree...