The texure of mooshroom udder layers are offset by one pixel to the left. I tested this in creative mode, with adult and baby mooshrooms spawned via a spawn egg. Cows are unaffected by the issue.
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Both of the udder glitches visible in the attachment have been fixed in Minecraft PC Edition. (The broken udder in 1.8.2 and the udder offset in 1.12), guess we just have to wait for those fixes to come to PE.