There are two glitches here.

First Glitch

The first way is for after you turn on the power.

Then when the curtains open you will notice that there are two ramps that you can walk on. One on each side of the stage.

When the dogs come, look at the ramp, at the top, for a corner.

If you find it, you can stand on the corner, and it will appear as if you are floating.

If you do it right, the dogs will gather on each side of you, but not attack you.

Second Glitch

The second way is also after you turn on the power.

Go to the side of the teleporter.

From there, go into the little corner in between it and the wall.

Kneel then just camp there.

The dogs will come to you and not attack.

This may be an easier method than the first one above.