They should be as sleek as seals :). Old saying we had on the AusRFS.
Though individual horses are different, though I did make an RSPCA complaint about 8 horses that where litterally skin and bone, and eating the tumble down shelters, that is not acceptable.
2 disappeared, one with an impaled shoulter, and one with that much green coloured discharge coming from his nose.
The others got moved to a beatufiul large field, and already they are filling out, there ribs less visable and there not as hollow. Adn they look happy.
I would go into cardiac arrest if I saw Red with protruding hips/ribs, I would know there was something wrong.