This animal has double the chance of becoming sick.
XPless
This animal will yield half the normal XP.
Hungry
This animal eats double.
Unproductive
This animal has a lower chance of producing loot.
Less Fertile
This animal has reduced reproduction rates.
Hungerless
This animal can feed on its own.
To upgrade pens, you must obtain the Horseshoe from the Horse animal, then convert the item into Fences to use on upgrading your pen size [ by 1 each time ].