feed him lots of hay if you can !! Also, being a bit chubby can be helpful in the winter, not fat or obese though.
I have a horse who is about 21 or so, he doesnt get blanketed & he's fine all winter [in wisconsin] if you see him shivering or looking cold I would talk to the owners again about blanketing, if not I wouldnt worry about it.
Gypsy & Scout <3Everybody is a genius. But if you judge a fish by its ability to climb a tree it will live its whole life believing that it is stupid. ~Albert Einstein