A widely-known (but nameless, here) CFI from the south-east was flying a family to Germany in an AA5 when the family cat escaped from its basket, defied all attempts to restrain it and lodged itself under the left-seat pedals, hissing. A diversion was made, using gentle rudder, and the beast was again caged for onward transport, with extra string. The pilot involved told me that had a significant rudder input been required, it would have been accompanied by crunching noises.