Sheltie and the snow pony

It's snowing in Little Applewood. On the way back from a ride on the snowy downs, Emma and Sheltie discover a very thin pony, tethered and left to fend for himself and in danger of freezing to death. Emma decides to rescue the pony, who stays with Sheltie in his paddock until he gets better. Eventually, the mystery of the pony is solved when it leads Emma and Sheltie to its owner: an old lady who...