Cattle is the name for animals in the bovine family, so cows, bulls and calves. Sheep is the name for animals of the ovine family, i.e. ewes, rams and lambs. Goats are animals from the caprine family. All of them are livestock. read more
Sheep and goats are not considered cattle because they are not bovine species. Cattle are a different species of animals than sheep or goats. That would be like saying all pets are dogs even thought cats are feline not canine. read more