Tinker

Little Tinker sees it as his duty to herd the foals in and out each morning when they come with their mums for a feed. He only does it to the two of them, no interest in any other horse or pony however big or small.

The foals don't seem to mind him, as you can see from this shot where he's nipping an ankle and the foal doesn't react.

Here's the boy when he had just been born:
https://www.blipfoto.com/entry/2052120807252952335