Quote - I bought the Daz millenium horse for one job and had to scrap it because of the horrible distorted legs.  Still no fix that I am aware of. 

---I would be happy to look at an example. I have seen quite a few GORGEOUS renders of the Millenium Horse and I cant imagine what you mean without a reference.

Err... Daio, myself, and a whole host of other people who know about horses told Daz repeatedly about Rosinante's legs.
If it were a real horse, it couldn't walk. It would be put down.
To the layman it probably looks fine, but the front shins (cannon) are bowed/bulged slightly (even in SR1) the position of the knee being adjustable up and down???
The back cannon is actually worse than the front. (The front knee was a poorly done fix to the original version, where the relation between forearm and cannon was so off, it was scary. I remember half a million horse leg photos lol.)
There is proper relation between the length of a horses forearm and shin. Moving the knee up and down...really?
There is a lot wrong with that horse, but the first version was absolutely atrocious from a horse person's point of view. Holy yikes lol.
The neck. OMG the neck. You know a horse bends at the poll, right? Same as humans don't have the head attached to half way down their back with one bone. Would it make sense to have the head move at the point where it attaches to the spine, rather than about a hand length down the neck?
I realize that would create "crumple zones" at the top of the neck for some positions, so I can forgive it a little, but it often makes it very hard to pose the head naturally and a lot has to be fixed in postwork.
And the mane should/could have been done differently. Not attached to the neck.
For any future horse (and if you make one using Genesis you're going to really really upset people, I warn you now.) don't attach the mane, make it a separate figure supporting the morphs.

I strongly - strongly - suggest any modeller who does a new horse gets the model checked by a vet or a horse breeder before finalizing it.
You think if you released a human figure with legs that bow in the wrong direction, people wouldn't notice? :) Horses are among the most well known animals, along with dogs and cats. Getting those wrong will be noticed, because there will be enough experts in horse/dog/cat confimation to point it out to you.

Dangerous place to be, I'm sure. :)

Silke