Is it possible to gather the roaming animals into a pasture like Llama, Cows, Horses, etc? I want to try and make a mod for it but no need wasting my time if it won't work. I just started playing Banished. I kept getting frustrated when those animals were around and I couldn't get them in a pasture. I searched and found it doesn't work like that. I then looked for a mod for it but none exist.
There's a Deer as livestock mod.
As Gatherer said, you can use the Deer As Livestock (http://www.banishedinfo.com/mods/view/273-Deer-As-Livestock"). Therefore you need to buy domesticated deer from livestock merchants. Actually it's a wild animal and if it is frustrating to get them, you can try this Tool (http://www.banishedinfo.com/mods/view/853-Go-Hunting") for active hunting.