Answer:
It is the great nemesis of the lactose intolerant.
What has two legs but doesn't walk?
Two horses, swiftest traveling, harnessed in a pair, and grazing ever in places. Distant from them.
What do you fill with empty hands?
As a whole, I am both safe and secure. Behead me, I become a place of meeting. Behead me again, I am the partner of ready. Restore me, I become the domain of beasts.
If itβs information you seek, come and see me. If itβs pairs of letters you need, I have consecutively three. What am I?