You get Papi by visiting the campaign page in the US:
If you are not from the US you will need a MANUAL proxy since the 'game' is flash based (sorry)
try 220.127.116.11 80
You can use http://webwarper.net/ww/ if you only want Papi.
You get Chloe by playing Puppy Roundup:
I've put the locations under each dog. Scroll to the bottom of the page to find them. Click the dog, and then click the message that will appear above it's head.
4. http://www.stardoll.com/en/user/ (this puppy is on the left side of the page)
Chloe AND Papi will be in a bag to the right of your closet.