YOU SAID:

pigs act pig like only when with other pigs

INTO JAPANESE

豚は他の豚と一緒の時だけ豚のように行動

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Pigs act like pigs only with other pigs

INTO JAPANESE

豚は他の豚とだけ豚のように振る舞う

BACK INTO ENGLISH

Pigs behave like pigs only with other pigs

INTO JAPANESE

豚は他の豚とだけ豚のように振舞う

BACK INTO ENGLISH

Pigs behave like pigs only with other pigs