Proverbs 30:29-31 Quickness

²⁹ “There are three things that are stately in their stride,
    four that move with stately bearing:
³⁰ a lion, mighty among beasts,
    who retreats before nothing;
³¹ a strutting rooster, a he-goat,
    and a king secure against revolt.

There are differing translations of the second animal in the list we are studying . . . some say a rooster, while others mention a war-horse, or a greyhound.

In any of these cases, I think we can surmise that Agur was talking about a stately and beautiful movement, but that it is characterized by quickness.
The war-horse is quick to obey his rider, and is often trained in special steps and strides to utilize in battle. In the medieval era, the horse was trained to obey pressure from the rider's legs, not just his hands on the reins. They were trained to kick behind them, to trample the enemy, and many more movements that needed to be quick in order to be effective.
The rooster is quick to "strut his stuff" at the least provocation -- whether to impress the hens or to intimidate an opponent. He has a whole vocabulary of movements that are easily "read" by the hen or rooster who views them.
And the greyhound is quick and lithe, able to hunt by speed and pursuit. The greyhound's long legs and compact muscles are combined with keen eyesight -- they can see small animals bounding about a half mile in front of them!

Are we quick to follow the commandments of our Lord? Are we quick to do His will?

I will hasten and not delay
    to obey your commands.  Psalm 119:60

And Moses quickly bowed his head toward the earth and worshiped. And he said, “If now I have found favor in your sight, O Lord, please let the Lord go in the midst of us...." Exodus 34:8-9a

Let us be quick to learn and to do His will!