src/main/java/systems/brn/tweaks/Tweaks.java

@@ -30,6 +30,12 @@ public class Tweaks implements ModInitializer {
     public static final GameRules.Key<GameRules.IntRule> ENDER_EYE_POP_CHANCE =
             GameRuleRegistry.register("enderEyePopChance", GameRules.Category.PLAYER, GameRuleFactory.createIntRule(20, 0, 100));
 
+    public static final GameRules.Key<GameRules.IntRule> LEASH_BREAK_DISTANCE =
+            GameRuleRegistry.register("leashBreakDistance", GameRules.Category.PLAYER, GameRuleFactory.createIntRule(10, 0, Integer.MAX_VALUE));
+
+    public static final GameRules.Key<GameRules.IntRule> LEASH_ELASTIC_DISTANCE =
+            GameRuleRegistry.register("leashElasticDistance", GameRules.Category.PLAYER, GameRuleFactory.createIntRule(6, 0, Integer.MAX_VALUE));
+
     @Override
     public void onInitialize() {
     }

src/main/java/systems/brn/tweaks/mixin/LeashableMixin.java

@@ -0,0 +1,32 @@
+package systems.brn.tweaks.mixin;
+
+import net.minecraft.entity.Entity;
+import net.minecraft.entity.Leashable;
+import net.minecraft.server.world.ServerWorld;
+import net.minecraft.world.GameRules;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.Constant;
+import org.spongepowered.asm.mixin.injection.ModifyConstant;
+import systems.brn.tweaks.Tweaks;
+
+@Mixin(Leashable.class)
+public interface LeashableMixin {
+
+    @ModifyConstant(
+            method = "tickLeash",
+            constant = @Constant(doubleValue = 10.0)
+    )
+    private static double modifyLeashBreakDistance(double original, ServerWorld world, Entity entity) {
+        GameRules.IntRule rule = world.getGameRules().get(Tweaks.LEASH_BREAK_DISTANCE);
+        return rule.get();
+    }
+
+    @ModifyConstant(
+            method = "tickLeash",
+            constant = @Constant(doubleValue = 6.0)
+    )
+    private static double modifyLeashElasticDistance(double original, ServerWorld world, Entity entity) {
+        GameRules.IntRule rule = world.getGameRules().get(Tweaks.LEASH_ELASTIC_DISTANCE);
+        return rule.get();
+    }
+}