In this instructable, you will make a spinning laser, similar to those expensive laser dog toys, by attaching a laser to a pen.
It's great fun for any dog/pet!
Step 1: Materials
You will need:
-1 class IIIA or below Laser (you can pick one up at RadioShack)
-1 plastic cd/dvd drive (or other suitable body with properly sized holes)
-And of course Laser Safety Goggles rated for your laser's bandwidth