Shabbos 5:2-3

Shabbos 5:2

A donkey may go out on Shabbos wearing a cushion if it is attached. Rams may go out with their genitals tied (so that they will not copulate). Sheep may go out with their tails tied up or down, or covered (to protect their wool). Goats may go out with their udders tied. Rabbi Yosi prohibits all of these things except for the sheep being covered. Rabbi Yehuda says that goats may go out with their udders tied tightly to make them stop lactating but not tied loosely to catch their milk.

Shabbos 5:3

A camel may not go out on Shabbos with a pad (that tends to fall and may come to be carried), nor with a front leg tied to a hind leg, nor with a leg tied limiting it to three legs. These latter rules apply to all animals. One may not tie camels in a row, one behind the next, and lead them but he may take all of their ropes in his hand and lead them as long as he doesn’t wrap the ropes around his hand. (The Gemara attributes the prohibition against wrapping the ropes to shaatnez – some ropes were made of wool fibers and others of linen – rather than to a Shabbos prohibition.)