פירוש על עבודה זרה 32:16

Rabbah b. Ulla explains that the Mishnah prohibits selling a mutilated lion which is not fit for work, and it follows the opinion of R. Judah from the previous mishnah who forbade selling maimed animals. But an unmaimed large wild animal would be prohibited, even according to the other rabbis, even if it does not present a danger to the public.
Ashi says that all lions are considered “maimed” when it comes to work. After all, a lion cannot be put to work. Thus a lion that does not present a danger could be sold. But a different wild animal that can do work cannot be sold under any circumstance.