It's ironic, because typically horses in third world countries are only bone thin because the people can barely afford to feed themselves and they NEED the horse just to eek out a livelihood. They're not typically abusive or cruel, they're just put in a really lousy situation.
Compare that to North America, the land of excess, where we CAN afford to feed them and treat them well and shudder at HOW many cases we hear of annually of sick twisted freaks that delibrately starve, abuse and torture horses (or any animal).
At least they respect the animal in third world countries, as much as they're able to and appreciate what it does for them. I was in Cuba and a guy running trail rides had very lean but fairly healthy looking horses. I paid him more in a tip then I did for the entire ride because it was obvious he cared for his animals. We saw some really skinny horses in Cuba, but I didn't see one instance of abuse or mistreatment.