Abe is Lorne and Sherry's child. He initially had four fingers, and from interviews, Lorne seems to have never liked the switch to three-fingered Mudokons. This self financed Abe game gave them a chance to set the record straight about his four fingers.
I personally prefer the look of the four-fingered paw. Not to mention, I imagine having 2 fingers and a thumb would make simple tasks -- let alone manual labor -- a bit more difficult.
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