As the subject do ask. Who is your favorite anime pet?
example of pets: Pen-Pen [Evangelion]
Luna & Artemis [Sailor Moon]
Mokona [Reyearth]
Keroberos [Cardcaptor Sakura]
Well, the above are just examples...just giving you a clue.
My favorite is actually Mokona because He's useful in any occation or places. He can save you from danger too. Also he can guide you. Lastly, he's so cute and you can have an argument with him...hehehe.