Based on the resists in the screenshot it looks like it's a hiryu and not a lesser hiryu... If you look at uoguide it's resists in fire cold energy and poison is above the range allowable for lesser hiryu's... Also I don't remember if the HP gets cut in half when hiryu's and lesser hiryu's get tamed like GD's, if it does get cut in half then it would've had to been a 960+ HP before tamed which could only be a hiryu...
Does it only take 3 pet slots?