Still, we should not jump to conclusions in every case of a skinny horse. For instance, if you see a skinny horse in amongst a herd of ones in good flesh, it could be a hard keeper. And it DOES take a lot of time to fix, if indeed you can. I'm pretty sure that "Corporal" (1982-2009, RIP), who was a skinny 4yo when I beat out the Meat Market by paying $140.00 for him at auction (1986), had never been in good flesh. He never did fill out and get fat.