Ouroboros Spine The trouble was...

Kau has played this game before and she has understood one important thing - attacking paws that rise in the air is pointless. That sticking to targets at her own eye-level is more practical. Simply because in her limited experience, never had anyone been able to lift all four paws up. 

So - she ignores that O's foot that she cannot reach and goes swiftly and toothily after the other one. Intent on removing at least one of the digits.