I did a quick search on the Traders Forum. A 2.4 star dreadmare sold for 150 million on Atlantic. The higher the score on pet power calculator the more it's worth.
I'd say post it on the Traders Forum to get the most money for it. I'd make an offer, but it would seem like an insult. Beside a Hawkwind Robe and Minax's Sandles I own nothing of value.