Originally posted by Janet:
Yes, some TB lines are “known for being belligerent”, or hot, or whatever. But they are “known for” because people are looking for a reason/excuse for the horse’s temperament.
For every “hot” line, you will find plenty of laid back relaxed horses in that line too.
You can’t give all the credit to the mares either.
Look at this pedigree
Spy Illusion
Nasrullah and Princequillo twice each, plus another dose of Nearco through Royal Charger. A recipe for a “hot horse”.
But he is a complete pussy cat…
That’s because there’s a little of that precious Hyperion blood in his pedigree 
I have to agree with those who said that a horse’s handling can bring out certain personality traits. So many things go into the personality of a horse. Some folks get along with highly reactive horses and some don’t. And that’s how these reputations got started in the first place, IMO. These infamous stallions were loved by some and hated by some.
And accounts of the personality of a horse’s dam are (obviously) far more difficult to find. But famous broodmares like Cinderella, Canterbury Pilgrim, and Vampire have stories of their own!
The accident with Jeff Lukas and Tabasco Cat occurred when Tabasco Cat was 2 years old and got loose- I believe that Lukas tried to stop him and Tabasco Cat collided with him. I’ve read that Tabasco Cat settled down after he retired. He always sounded more nervous than ornery to me but I never met him.
Also wanted to add that I know a Saint Ballado son who is very sweet and smart.
And while I agree that horses who did well on the track sometimes are more challenging to work with in their OTTB careers, I also know of one horse who ran second to the mighty Cigar and became a lovely pleasure horse.