I grabbed mostly studs I think. Prettier composed pictures. That's why they look so beefy. But looking at hip and shoulder angles and the hair on some. I would agree there is some heavy blood in there.

No clue of the breed mix. I do know of a few people that have gotten off the range Canadian mustangs, sent off blood/ hair whatever it is, and got back the result that it is strong Spanish blood, like the Pryors or Kiegers in the US.