In preparation for the upcoming Prehistoric Party, Club Penguin has posted a Frequently Asked Questions on Dino Puffles! It's got all the information you need to know about Dino Puffles.
The information tells you that to take a Dino Puffle for a walk, you need to dig up an egg at the Prehistoric Party. And that your Dino Puffle wont run away, even if your membership expires! Awesome! In the picture above are all the available Dino Puffles.