This mod adds into the game a new spell called Summon Kyloth. Kyloth is a dragon Eidolon, or a summonable creature that grows with you. His spell tome can be found at the College of Winterhold, in the Hall of the Elements. Right as you're walking in, there will be a book on the floor, titled Spell Tome:Call Kyloth. It would've been Summon Kyloth, but there was a character limit for the item's name. Kyloth can be summoned for 20 mana, and stays on the material plane for five minutes.

Installing the mod
Download it manually, and extract the .esp into the data folder of your game!

Uninstalling
Go into the data folder of your game and delete it like you would any other file.

Notes
-Kyloth is a full-sized dragon, so I wouldn't recommend summoning him inside anywhere unless you like a lot of clipping.
-As pointed out by GuardianofLight137, there are a couple bugs with Ky. He'll either decided to be a mole and go into the ground, or be a news station helicopter and fly around like an idiot. While I don't have much knowledge to fix these problems right now, I have a temporary fix. To debug Ky, summon another creature, dispelling him, and just do stuff until that thing poofs. Then bring Ky back. If problems persist, let me know, and I'll make a shorter duration version of the spell. Maybe that'll fix things.
-UPDATES 7/7/15: I finally got around to updating this mod, and while I'm unsure if the bugs from 1.0 will persist, I have balanced it considerably. Kyloth still scales with you, but if I did everything right it should be an apprentice level spell now, and Kyloth only remains active for five minutes. Please let me know if problems persist. I've enabled bug report capability on the mod now, and I will be checking back regularly. Ideally, Kyloth would have become a shout instead of a spell, but I couldn't figure out how to properly do that. So, he's a spell for the time being.