Coosa was a big horse. But he had pretty decent bone and foot underneath him, unlike the monstrous Kid Clu of crappy-leg fame. Or many of his direct descendents... because most folks bred to him for BULK and not for underpinnings, that's for sure. As evidenced by MOST of his offspring.

Though, I have to say, I've heard positive and suprising things about the athletic ability and cow of the Kid Clu line.

Here's a mare by Touchdown Kid by Kid Clu, as an example of the trademark poor bone and feet.

A great deal of intelligence can be invested in ignorance when the need for illusion is deep.
Saul Bellow (1915 - 2005)