Program: 187515
Project: 187515
Buggy source:
@Override public boolean shouldStart(){
  if (behaviorSkill == null || !behaviorSkill.isActive() || behaviorSkill.getBehavior() != BehaviorState.Aggressive) {
    return false;
  }
  if (myPet.getDamage() <= 0 && myPet.getRangedDamage() <= 0) {
    return false;
  }
  if (!myPet.getCraftPet().canMove()) {
    return false;
  }
  if (petEntity.getGoalTarget() != null && petEntity.getGoalTarget().isAlive()) {
    return false;
  }
  for (  Object entityObj : this.petEntity.world.a(EntityLiving.class,this.petOwnerEntity.boundingBox.grow((double)range,(double)range,(double)range))) {
    EntityLiving entityLiving=(EntityLiving)entityObj;
    if (entityLiving != petEntity && entityLiving.isAlive() && petEntity.e(entityLiving) <= 91) {
      if (entityLiving instanceof EntityPlayer) {
        Player targetPlayer=(Player)entityLiving.getBukkitEntity();
        if (myPet.getOwner().equals(targetPlayer)) {
          continue;
        }
        if (!PvPChecker.canHurt(myPet.getOwner().getPlayer(),targetPlayer)) {
          continue;
        }
      }
 else       if (entityLiving instanceof EntityMyPet) {
        MyPet targetMyPet=((EntityMyPet)entityLiving).getMyPet();
        if (!PvPChecker.canHurt(myPet.getOwner().getPlayer(),targetMyPet.getOwner().getPlayer())) {
          continue;
        }
      }
 else       if (entityLiving instanceof EntityTameableAnimal) {
        EntityTameableAnimal tameable=(EntityTameableAnimal)entityLiving;
        if (tameable.isTamed() && tameable.getOwner() != null) {
          Player tameableOwner=(Player)tameable.getOwner().getBukkitEntity();
          if (myPet.getOwner().equals(tameableOwner)) {
            continue;
          }
 else           if (!PvPChecker.canHurt(myPet.getOwner().getPlayer(),tameableOwner)) {
            continue;
          }
        }
      }
      this.target=entityLiving;
      return true;
    }
  }
  return false;
}

Fixed version (ground truth):
@Override public boolean shouldStart(){
  if (behaviorSkill == null || !behaviorSkill.isActive() || behaviorSkill.getBehavior() != BehaviorState.Aggressive) {
    return false;
  }
  if (myPet.getDamage() <= 0 && myPet.getRangedDamage() <= 0) {
    return false;
  }
  if (!myPet.getCraftPet().canMove()) {
    return false;
  }
  if (petEntity.getGoalTarget() != null && petEntity.getGoalTarget().isAlive()) {
    return false;
  }
  for (  Object entityObj : this.petEntity.world.a(EntityLiving.class,this.petOwnerEntity.boundingBox.grow((double)range,(double)range,(double)range))) {
    EntityLiving entityLiving=(EntityLiving)entityObj;
    if (entityLiving != petEntity && entityLiving.isAlive() && petEntity.e(entityLiving) <= 91) {
      if (entityLiving instanceof EntityPlayer) {
        Player targetPlayer=(Player)entityLiving.getBukkitEntity();
        if (myPet.getOwner().equals(targetPlayer)) {
          continue;
        }
        if (!PvPChecker.canHurt(myPet.getOwner().getPlayer(),targetPlayer)) {
          continue;
        }
      }
 else       if (entityLiving instanceof EntityMyPet) {
        MyPet targetMyPet=((EntityMyPet)entityLiving).getMyPet();
        if (!PvPChecker.canHurt(myPet.getOwner().getPlayer(),targetMyPet.getOwner().getPlayer())) {
          continue;
        }
      }
 else       if (entityLiving instanceof EntityTameableAnimal) {
        EntityTameableAnimal tameable=(EntityTameableAnimal)entityLiving;
        if (tameable.isTamed() && tameable.getOwner() != null) {
          Player tameableOwner=(Player)tameable.getOwner().getBukkitEntity();
          if (myPet.getOwner().equals(tameableOwner)) {
            continue;
          }
 else           if (!PvPChecker.canHurt(myPet.getOwner().getPlayer(),tameableOwner)) {
            continue;
          }
        }
      }
      if (!PvPChecker.canHurtCitizens(entityLiving.getBukkitEntity())) {
        continue;
      }
      this.target=entityLiving;
      return true;
    }
  }
  return false;
}