It can turn anyone or anything into young toddlers. It could even work on robots. Mechanikat lured Krypto and The Dog Star Patrol into a on an asteroid and Snooky Wookums blasted them with the Puppy Ray turning them into puppies. He planned throw them onto another planet where no one would find them, but eventually the puppy Dog Stars figured everything and used the Ray to turn themselves back to normal. Krypto used the device to turn Mechanikat into kitty.