The mishna and gemara deal with items that animals are not allowed to go out with in public on Shabbat. Different items are forbidden for different reasons. The gemara explains the reality of each of the cases mentioned in the mishna. The mishna says that the cow of Rabbi Elazar ben Azaria would go out with a strap between its horns and the rabbis were not pleased. The gemara explains that this wasn't his cow but his neighbor's cow and it was considered his since he could have rebuked her, but didn't. The gemara begins to discuss the importance of rebuking others and the issue of communal responsibility.