From the story: Heavy weighs the crown, because the First Laws say the Lycaeon must produce an heir from a ‘Born Wolf’.
And you say the wolves don't need to be able to differentiate. How then would the law be upheld. Like if it happens that the heir isn't a born wolf (without knowledge) would there be a consequence? .
Just thinking.!!
As with Humes, they're civilised and have family tree and documentation, plus they keep track of the bloodline because it's important.