Specie/Large physical change?

I'm requesting help on something I'm quite curious about; would I be able to change Pearce into a wolf dog? He doesn't have a lot of dominating characteristics and such, plus a roleplayer had a suspicion he was a wolf-dog and I feel like it'd suit him evermore. Pearce's description is beknownst to me as I didn't save it when I sent off the application and I got confirmation by an admin in the shoutbox that I could begin roleplaying him. IF I do get permission, would I need to buy it as a physical characteristic? I know it's a large change, but I feel like it'd bring more depth to the gangly-legged youngster.

Please respond as soon as possible, I'm super interested in this. Also, if it does cost bones to change him if it's possible, would I be able to pay with Rylo? Thanks!