I see a lot of pets that are custom? How do I get my pets as custom?

You have to submit a custom overlay (a 200x200 custom image). It costs 500 csc to do so.

You can do it here. It'll take a few days for you to be able to use the image, since staff has to approve it first c:

Like, I have to draw art? What if I can't draw? also, what if it doesn't get approved? do they still keep my csc?

They will refund you if your image is denied (just like they do with Custom wearable!)

If you can't draw I suggest checking the Art market or Profile/Graphic board. There's a lot of users there that offer to make custom overlays (either 100% customs ones or modified official art) for you c:

a custom overlay doesn't even have to be a complete redraw or a really modified piece of official art - my pet Haggard is a Reborn Legeica and I just changed the color of the body from orange to black and removed the smile and staff accepted it when I sent it in as a custom overlay.

Well, the pet I want is a kind of tribute to Lo Pan from Big Trouble In Little China, and I'm trying to get my pet drawn to look as much like Lo Pan as can be without violating any rules.