Stablemate

This is Lester, Millie's new(ish) pal.
They get on reasonably well... he follows her around the field at a safe distance and whinnies to her when she returns from a ride, she remains relatively indifferent to him and mostly leaves him to it, apart from seeing him off if he ever dares to try and share her haynet.
Millie most definitely has her priorities sorted :)