This is a big problem. I think it's actually worse than thinking horses are ok when they are 'a little bit heavy.' A gal was over at my place and was very upset at the 'condition' of my pony. The pony's ribs are not visible nor even easily felt. "Ponies are supposed to be roly-poly," she insisted. I explained to her that ponies are not supposed to be 'roly poly' and that overweight can kill any horse, explained laminitis and metabolic diseases. Her answer was "but ponies are supposed to be roly-poly." I give up.