The .pro aftermarket is quieter than a sponsored silence at a monastery but strong keywords that fit the extension do sell. For example, Chef.pro sold for $3,650 on Sedo in May and had multiple bidders.
I don't think Animals.pro is a natural fit with .pro in the conventional sense but I like the animal welfare angle. Value-wise, I think you would struggle to recoup your reg fee. I wouldn't place any value on Estibot, it values Game.pro at reg fee, Game.info at $130, and Game.net at $1,300.