void Update()
    {
        timer    += Time.deltaTime;
        nav.speed = speed;

        if (timer >= newTarget && (docHealth.docIsDead() == false))
        {
            NewTarget();
            timer = 0;
        }

        if (gameObject.transform.position.x - target.x <= 1f && gameObject.transform.position.y - target.y <= 1f)
        {
            NewTarget();
            timer = 0;
        }
    }