Answer:
Left to right Iām quite bright. Right to left I might bite.
Two in a whole and four in a pair. And six in a trio you see. And eight's a quartet but what you must get. Is the name that fits just one of me?
Two horses, swiftest traveling, harnessed in a pair, and grazing ever in places. Distant from them.
If you drop me I'm sure to crack. But give me a smile and I'll always smile back.
I have one door and five rooms what am i
I have two eyes in the front and a lot of eyes on my tail