Genkaus's arguement in summary:
I am sentient and engage in certain behaviors.
Other is behaving in a certain way.
Thus Other is sentient.
or
I am human and can run.
Fido can run.
Thus Fido is human.
I am sentient and engage in certain behaviors.
Other is behaving in a certain way.
Thus Other is sentient.
or
I am human and can run.
Fido can run.
Thus Fido is human.