Halocho #561 - Laws of the horse and buggy

The Torah prohibits using different species of animals at the same time. This is called Kil'ay Beheima.

One may not pull a wagon using 2 different types of animals, e.g. a donkey and a horse.

One may not ride in a wagon being pulled by 2 different types of animals.

One may not even tie 2 different types of animals together to prevent them from escaping; this applies to birds as well.

However, one may use a female and male of the same species as well as small and large animals of the same species. E.g. one could pull a wagon with a cow, a bull and a calf.

Source: Kitzur Shulchan Aruch 175:2, 3, 5

- Danny
Tuesday, 20 Iyar 5770 - 35th day of the Omer