Enter the 'Menu' by selecting the suitcase icon at the top right corner of the screen. Then choose the key icon and enter one of the following codes (without the quotes) to enable the corresponding effect.
Unlock Pirate Lemur and Pirate Outfit: Enter the code 'aptcay'
Unlock Astronaut Mandrill and Spacesuit: Enter the code 'psworn'
Unlock Egyptian Mau and Red Scarf: Enter the code 'ctzluv'
Unlock Rockstar Boxer, Leather Jacket Suit and Spiked Collar 2: Enter the code 'eggsuk'
Unlock Angel Maine Coon, Angelic Wings/Halo, and able to adopt a Angel Maine Coon: Enter the code 'thirst
Unlock Army Ocicat, Training Pants, Dog Tag 2, and able to adopt a Army Ocicat: Enter the code 'spacec'
Unlock Diva Siamese, Fluffy Scarf 2, Sunglasses 2, and able to adopt a Diva Siamese: Enter the code 'tpcbkq'
Unlock Ballerina Russian Blue, Ballerina Outfit, and able to adopt a Ballerina Russian Blue: Enter the code 'swindl'
Unlock Clown Marmoset, Clown Hat 2 and Frilly Collar 2 furbal Devilish Tamarind and Devilish Wings/Horns: Enter the code 'edcrfv'
Unlock Cheerleader White Persian, Cheerleader Outfit, Pom Poms, and able to adopt a Cheerleader White Persian: Enter the code 'dr68jj'
Unlock Fairy Yorkie, Frilly Collar, Fairy Wings 2, and Crown thrill Native American Chihuahua and Native American Feather: Enter the code 'stinko'
Unlock Superhero Husky and Flying Cape gallon Surfer Beagle, Surfer Pants, Sunglasses, and Beach Ball: Enter the code 'queenq'
Unlock Rocket Abyssinian, Rocket Pack, and able to adopt a Rocket Abyssinian: Enter the code 'lardsi'
Unlock Ballerina Capuchin and Ballerina Outfit 2: Enter the code 'petcat'