Never leave your gerbil
alone out of its tank in the house! Protect it from electric wires and
houseplants, as some may be toxic. Prepare a safe area in the room with a
blanket on the floor if you want. Place some obstacles around it to make a
confined area. You can also let it walk on the couch. Think like a gerbil, it
will chew everything in its path: door corner, paperboard box, wires, etc.
If it run away, it can chew
it's way trough walls and make a lot of damage to the house, and even create
electrical problems or even fire.
can make an enclosure with small cage wall sold in pet shops for this purpose.
You can also try to make one yourself with paperboard pieces. Walls must be at
least 8 inchs (20cm) high.