Onyx horse donkey marble pen holder Carved stone

Up for auction is this carved onyx donkey or horse. excellent condition, no rips or cracks or signs of wear.  There is a little hole on the top of possibly a pen?  It measures 4.5" across and about 3" to top of head. Ivory color with a rust grain running through. Thanks so much for looking! We have a very clean, smoke-free home. Please check out my other items.