Halakhah for Shabbat 5:1
בַּמֶּה בְּהֵמָה יוֹצְאָה וּבַמָּה אֵינָהּ יוֹצְאָה. יוֹצֵא הַגָּמָל בְּאַפְסָר, וְנָאקָה בַחֲטָם, וְלֻבְדְּקִיס בִּפְרֻמְבְּיָא, וְסוּס בְּשֵׁיר, וְכָל בַּעֲלֵי הַשֵּׁיר יוֹצְאִים בַּשֵּׁיר וְנִמְשָׁכִים בַּשֵּׁיר, וּמַזִּין עֲלֵיהֶן וְטוֹבְלִין בִּמְקוֹמָן:
With what may a beast go out (on the Sabbath)? [For a man is commanded vis-à-vis the resting of his beast on the Sabbath. And something with which the beast is guarded is not considered a burden; and something with which it is not guarded is considered a burden.] A camel goes out with a rein; a na'akah (a longnecked camel) [The gemara states: specifically, a white one, which requires greater guarding], with a chatam [They take an iron ring, pierce the camel's nose, and insert it.]; a Libyan ass [which is especially tough and strong and requires greater guarding than other domestic asses], with an iron rein; a horse, with a sher [a kind of band around its neck, with a ring, through which a rope is inserted and by which the beast is pulled.] And all sher animals [such as hunting dogs and small animals] go out with the sher [around their necks, with the rope fixed in the sher], and are pulled by the sher [i.e., if he wishes, he pulls the beast by the rope in the sher], and they are sprinkled upon (in place) [i.e., as they are, on the animal's neck, if they have incurred dead-body uncleanliness], and they are immersed in place. [The animal is placed in the water to immerse the sher. And even though it is ruled that all articles unique to a beast do not acquire uncleanliness, the sher and its like do acquire uncleanliness and require immersion. Since they are made for a man to lead the animal with, they are regarded as an article made for man's use.]