Hello!
Clean and dirty are being used to describe the lions' bloodline. If there is any inbreeding (for example if your main lion A had a cub B, and later your breed B to your main lion A - the cubs from that breeding would be "dirty")

You can check this by going to your lion's page and pressing the "view full hertage" button. When Just go trough all the names there, and if you get a "This lion has X instances of possible inbreeding." text, it means the lion is "dirty". If there is no such a text, it means lion is "clean".

However this doesn't have ANY effect in ingame functions, but people tend to price clean lions higher than dirty, because they are a bit harder to breed by keeping the bloodline clean.

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