Because Bukkit doesn't set this automatically with setTamed. Go figure. Fixes #1888

Changelog.txt

@@ -21,6 +21,7 @@ Version 1.4.08-dev
  + Added new experience bonus perk 'mcmmo.perks.xp.customboost.<skillname>' multiplies incoming XP by the boost amount defined in the experience config
  + Added Ender Dragon, Wither, and Witch to combat experience multipliers - they do not give XP by default
  + Added support for multiple mod config files, naming can be done as either armor.<modname>.yml or <modname>.armor.yml
+ = Fixed bug with Call of The Wild entities despawning
  = Fixed bug with updating (very) old user data.
  = Fixed bug with checking maximum durability of mod items.
  = Fixed exploit involving Call of The Wild.

src/main/java/com/gmail/nossr50/skills/taming/TamingManager.java

@@ -225,9 +225,9 @@ public class TamingManager extends SkillManager {
 
         for (int i = 0; i < amount; i++) {
             LivingEntity entity = (LivingEntity) player.getWorld().spawnEntity(player.getLocation(), type);
-
             entity.setMetadata(mcMMO.entityMetadataKey, mcMMO.metadataValue);
             ((Tameable) entity).setOwner(player);
+            entity.setRemoveWhenFarAway(false);
 
             switch (type) {
                 case OCELOT: