Heterochromia for Kittens & Puppies
Project: Pet Custom Content
by NekoKyu
Uploaded July 11, 2026, 9:50 p.m.
Updated July 11, 2026, 9:51 p.m.
Huge shout out to @paluding for collaborating with me on this and who honestly did most of the work as far as I'm concerned.
Download //
This is a default replacement mesh for kitten and puppy faces that allows heterochromia. This was done by separating the left and right eyes onto different groups and subsets so they can be colored independently. They have morphs , so these cuties will properly emote! This is possible thanks to @crispsandkerosene's blender plugin, make sure to grab it if you're interested in meshing for pets!
Pet heterochromia is NOT hereditary, and in fact only a pet's right eye color can be passed down. Heterochromia is a purposeful decision that you have to apply manually. Do this by opening a pet's AgeData inside their CharacterData.package, then find and change the eyecolor and/or alteyecolor lines to the desired colors. If you need better instructions, I go more in depth in my Pet Genetics How-To here.
Last but not least, consider grabbing my Kitten & Puppy Eye Fix! Maxis didn't enable eye colors for all ages, so without my fix only custom eye colors will actually display with heterochromia.
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