horse, cow, or chickens?

I think a dozen chickens would be the best to own. I say that because if I had a dozen chickens, I would have more than one, meaning I could use them for a variety of purposes. I could breed my chickens if I wanted to, so I could have more chickens for meat or for laying eggs. I could use the eggs as food. I could also sell or trade eggs for other useful items. It would be easier to take care of chickens also because there is no need for grooming.They wouldn't provide any kind of transportation, but if I needed to, I could just ask a neighbor if I could use their horse to go somewhere. Chickens are also very small, so if I got attacked it wouldn't hurt as bad or be as severe as if I was attacked by a cow or horse. This would help me have the ability to take care of the chickens without any kind of fear. These are my reasons for choosing the dozen chickens rather than a horse or cow.