Mordenkainen's Guardian Hound is a daily power available to Wizards at 9th level[AP]
Mordenkainen's Guardian Hound
Wizard Attack 9
The ghostly form of a snarling wolfhound appears before you and leaps into the fray.
Daily ✦ arcane, conjuration, implement
Effect: You conjure a Medium gaurdian hound that occupies 1 square within range, and the hound makes the following melee attack. Once per round as a minor action, you can have the hound repeat its attack. As a minor action, you can move the hound 6 squares. The hound lastss until the end of the encounter or until you dismiss it with a free action.
target: One creature adjacent to the hound
Attack: Intelligence vs. Reflex
Hit: 3d4 + Intelligence modifier damge. The target takes a -2 penalty to its next attack roll that targets you.