Long Borring, really don't feel like reading answer:
I'm honestly not sure... From what I understand with the limited information that i've gathered it looks like for the majority of dread warhorses are going from anywhere between 40-100mil... Then ofcourse you probably have the exception of the really "elite" ones that to the right buyer may sell for more then that... It really depends though. If somebody is willing to pay that price then thats how much it is worth to them, if there not then it is kind of hard to pre determine how much you will get for something. If the buyers not happy to pay the price that your asking then you won't get the asking price anyway, or you will but will just take alittle longer to advertise until the right buyer comes along. Another, thing that may make it difficult to sell could be if you just advertise that you're selling a 2.7 rated dread. It might just be me but usually when i'm hunting for a new pet, I like to view all of its stats and not just the pet rating. The thing about the pet rating is it could be 2.7 because of the resists, or because of the stats.. Or for a number of things, that's why it would also be good to list what its stats/resists and everything is as well.
Short get to the point answer:
Need more info then just the pet rating, what are the stats, ect?