‘whatever goes upon four legs or has wings is a friend’, and how? What justification is given for breaking these rules?

‘whatever goes upon four legs or has wings is a friend’, and how? What justification is given for breaking these rules?

In Animal Farm, who breaks the commandments, ‘Whatever goes upon two legs is an enemy,’ and ‘whatever goes upon four legs or has wings is a friend’, and how? What justification is given for breaking these rules?

‘whatever goes upon four legs or has wings is a friend’, and how? What justification is given for breaking these rules?