Today's daf is sponsored by Judy Schwartz "in memory of my very special mother Shirley K. Tydor (Sara Raizel bat Mordechai Yitzchak and Freidasima) on my birthday. A birthday is a time to make the world a better place: do a cheshbon nefesh (soul searching), give tzedaka, and thank one's mother for what she went through. And so I do, with love."

Why is it forbidden to sell large cattle to a non-Jew? After deliberations, they conclude that this is a decree lest the Jew rent it out or lend it, or concern of a "test ride" that may be done as Shabbat begins. Rav Ada permitted selling through a broker because these concerns don't apply in that case.

Rav Huna sold a cow to a non-Jew and claimed that perhaps he bought it for slaughter. Rav Chisda challenged him - why don't we worry about the matters mentioned previously? After deliberation, Rav Ashi defines in what situations it is permitted/forbidden.

Rabba sold a donkey to a Jew who was suspected of selling to non-Jews. Abaye challenged him and convinced Rabba that he had made a mistake. Within Abaye's challenge, he quoted a baraita that forbids a Jew from selling weapons to a non-Jew. Rav Dimi expanded this prohibition to selling weapons to Jewish bandits/robbers.

Can one sell defensive items to non-Jews? This is a subject of debate.