Wolves and Wolf-Riders -- Reading Material

It chanced that Celegorm and Curufin went on a hunt through the Guarded Plain; and this they did because  Sauron, being filled with suspicion, sent forth many wolves into the Elf-lands.  Therefore they took their hounds and rode forth. ... Now chief of the wolfhounds that followed Celegorm was named Huan.  He was not born in Middle-earth, but came from the Blessed Realm; for Oromë had given him to Celegorm long ago in Valinor. ... Huan followed Celegorm into exile, and was faithful; and thus he too came under the doom of woe set upon the Noldor, and it was decreed that he should meet death, but not until he encountered the mightiest wolf that would ever walk the world.

... for nothing could escape the sight and scent of Huan, nor could any enchantment stay him, and he slept not, neither by night nor day.

Lúthien spoke often to Huan in her loneliness ... and Huan understood all that was said.  For he comprehended the speech of all things with voice; but it was permitted to him thrice only ere his death to speak with words.

Now Huan devised a plan for the aid of Lúthien ... and he humbled his pride and suffered her to ride upon him in the fashion of a steed, even as the Orcs did at times upon great wolves.  Thus they made great speed, for Huan was swift and tireless.

But no wizardry nor spell, neither fang nor venom, nor devil's art nor beast-strength, could overthrow Huan of Valinor; and he took his foe [Sauron] by the throat and pinned him down.  Then Sauron shifted shape ... but he could not elude the grip of Huan without forsaking his body utterly.

Silmarillion, "Of Beren and Lúthien"

Then Sauron sent Draugluin, a dread beast, old in evil, lord and sire of the werewolves of Angband.  His might was great; and the battle of Huan and Draugluin was long and fierce.  {Huan mortally injures Draugluin.}

[Much later][Huan] turned aside therefore at Suaron's isle ... and he took thence the ghastly wolf-hame of Draugluin, and the bat fell of Thuringwethil.  She was the messenger of Sauron, and was wont to fly in vampire's form to Angband; and her great fingered wings were barbed at each joint's end with an iron claw.  Clad in these dreadful garments Huan and Lúthien ran through Taur-nu-Fuin, and all things fled before them.

By the council of Huan and the arts of Lúthien [Beren] was arrayed now in the hame of Draugluin, and she in the winged fell of Thuringwethil.  Beren became in all things like a werewolf to look upon, save that in his eyes there shone a spirit grim indeed but clean; ... he saw upon his flank a bat-like creature clinging with creased wings.  Then howling under the moon he leaped down the hill, and the bat wheeled and flittered above him.

Silmarillion, "Of Beren and Lúthien"

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Even the wild Wargs (for so the evil wolves over the Edge of the Wild were named) cannot climb trees.  For a time they were safe.

[Most of the Wargs sat in a circle] and in the middle of the circle was a great grey wolf.  He spoke to them in the dreadful language of the Wargs.  Gandalf understood it.

The Wargs and the goblins [= orcs] often helped one another in wicked deeds.  ... Sometimes [the goblins] rode on wolves like men do on horses.

The Hobbit, "Out of the Frying-Pan into the Fire"

"The Goblins are upon you! ... Behold!  the bats are above his army like a sea of locusts.  They ride upon wolves and Wargs are in their train!"

So began ... the Battle of Five Armies. ... Upon one side were the Goblins and the Wild Wolves, and upon the other were Elves and Men and Dwarves.

... the great bats swirled about the heads and ears of elves and men, or fastened vampire-like on the stricken.

The Hobbit, "The Clouds Burst"

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Aragorn:  "How the wind howls!  It is howling with wolf voices.  The Wargs have come west of the Mountains!"
...
Boromir:  "The wolf that one hears is worse than the orc that one fears."
Aragorn:  "True!  But where the warg howls, there also the orc prowls."

Gandalf addresses the leader of the attacking wolves: "Listen, Hound of Sauron!  Gandalf is here.  Fly, if you value your foul skin!"
[There follows a battle with the wolves.]
When the full light of the morning came no signs of the wolves were to be found, and they looked in vain for the bodies of the dead. ...  "It is as I feared," said Gandalf.  "These were no ordinary wolves hunting food in the wilderness."

Fellowship of the Ring, "A Journey in the Dark"

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Éomer says of Saruman:  "He has taken Orcs into his service, and Wolf-riders, and evil Men."

Two Towers, "Riders of Rohan"

Gandalf:  "Wolves and orcs were housed in Isengard, for Saruman was mustering a great force on his own account, in rivalry of Sauron and not in his service yet."

Fellowship of the Ring, "The Council of Elrond"

Merry describes Saruman's army setting out from Isengard:  "I saw the enemy go: endless lines of marching Orcs; and troops of them mounted on great wolves.  And there were battalions of Men, too."

Two Towers, p 171, Flotsam and Jetsam

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Picture:
http://tolkiengateway.net/wiki/File:John_Howe_-_Wolf_Riders.jpg