This may be diffrent than the story you know...
It all started 50 years before naruto was even born...
On that night around 8:00 the great dog demon of the east was at the village hidden in the leaves to find his newborn clid. The dog demon was not there to fight,he was just there to find his child and live on peace. Unbenownced to him the village was waiting and ready for him. In the hours ahead he could see fighting.As the village head the Hokage could not let the demon into the village. So,
he told the village ninja to fight. In the time proseeding, there was an amazing battle.Finally, after hours of fighting, the woman who kidnapped the child desided to come out and finnish the battle once and for all. The woman was the best ninja in the village.
What she did then was a shock to all in the village, she used a sealing jutsu that sealed the great and powerful dog demon of the east into his infant daughter.
50 years later...
"Don't let that thing into the village!" one ninja yelled. "We have to wait untill the 4th araves." another shouted. Another great beast was upon the village. The ninja of the time long ago were well set for the attack because they knew that the demon was on his way there. But this demon came out of now where. The village was on the verge of colapse when, on the back of a giant toad, the 4th Hokage arived! Then he used the same jutsu that the kidnapper used 50 years before, the sealing jutsu.