Guinea pigs will be targeted by, and run away from, foxes

src/main/java/dev/seano/sgp/mixin/FoxEntityMixin.java

@@ -0,0 +1,24 @@
+package dev.seano.sgp.mixin;
+
+import dev.seano.sgp.entity.ai.TargetGuineaPigGoal;
+import net.minecraft.entity.EntityType;
+import net.minecraft.entity.passive.AnimalEntity;
+import net.minecraft.entity.passive.FoxEntity;
+import net.minecraft.world.World;
+import org.spongepowered.asm.mixin.Mixin;
+import org.spongepowered.asm.mixin.injection.At;
+import org.spongepowered.asm.mixin.injection.Inject;
+import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
+
+@Mixin(FoxEntity.class)
+public abstract class FoxEntityMixin extends AnimalEntity {
+
+	protected FoxEntityMixin(EntityType<? extends AnimalEntity> entityType, World world) {
+		super(entityType, world);
+	}
+
+	@Inject(method = "initGoals", at = @At(value = "TAIL"))
+	private void initGoals(CallbackInfo ci) {
+		this.targetSelector.add(3, new TargetGuineaPigGoal(this));
+	}
+}

src/main/kotlin/dev/seano/sgp/entity/GuineaPigEntity.kt

@@ -13,7 +13,6 @@ import net.minecraft.entity.data.DataTracker
 import net.minecraft.entity.data.TrackedData
 import net.minecraft.entity.data.TrackedDataHandlerRegistry
 import net.minecraft.entity.mob.CreeperEntity
-import net.minecraft.entity.mob.MobEntity
 import net.minecraft.entity.passive.*
 import net.minecraft.entity.player.PlayerEntity
 import net.minecraft.item.ItemStack
@@ -42,8 +41,7 @@ class GuineaPigEntity(entityType: EntityType<out TameableEntity>?, world: World?
 
 
 		fun createAttributes(): DefaultAttributeContainer.Builder {
-			return MobEntity.createMobAttributes()
-				.add(EntityAttributes.GENERIC_MAX_HEALTH, MAX_HEALTH)
+			return createMobAttributes().add(EntityAttributes.GENERIC_MAX_HEALTH, MAX_HEALTH)
 				.add(EntityAttributes.GENERIC_MOVEMENT_SPEED, 0.2)
 		}
 	}
@@ -64,6 +62,7 @@ class GuineaPigEntity(entityType: EntityType<out TameableEntity>?, world: World?
 		goalSelector.add(6, FleeEntityGoal(this, CreeperEntity::class.java, 6f, 1.0, 1.25))
 		goalSelector.add(6, FleeEntityGoal(this, OcelotEntity::class.java, 6f, 1.0, 1.25))
 		goalSelector.add(6, FleeEntityGoal(this, CatEntity::class.java, 6f, 1.0, 1.25))
+		goalSelector.add(6, FleeEntityGoal(this, FoxEntity::class.java, 6f, 1.0, 1.25))
 		goalSelector.add(7, FollowOwnerGoal(this, 1.1, 10.0f, 4.0f))
 		goalSelector.add(8, WanderAroundFarGoal(this, 1.0))
 		goalSelector.add(9, LookAtEntityGoal(this, PlayerEntity::class.java, 6.0f))
@@ -253,7 +252,7 @@ class GuineaPigEntity(entityType: EntityType<out TameableEntity>?, world: World?
 		} else if (!other.isTamed) {
 			false
 		} else {
-			if (other.isInSittingPose) false else this.isInLove && other.isInLove()
+			if (other.isInSittingPose) false else this.isInLove && other.isInLove
 		}
 	}
 }

src/main/resources/sgp.mixins.json

@@ -4,6 +4,7 @@
   "compatibilityLevel": "JAVA_21",
   "mixins": [
     "CatEntityMixin",
+    "FoxEntityMixin",
     "OcelotEntityMixin"
   ],
   "injectors": {