The living entitys position is herein likened to a dogs. By chance a dog may have a very rich owner, and by chance he may become a street dog. As the dog of a rich man, he will live very opulently. Sometimes in Western countries we hear of a master leaving millions of dollars to a dog in his will. Of course, there are many dogs loitering in the street without food. Therefore, to liken the conditional existence of the living entity to that of a dog is very appropriate. An intelligent human being, however, can understand that if he has to live the life of a dog, he had best become Krsnas dog. In the material world a dog is sometimes elevated and is sometimes on the street, but in the spiritual world, Krsnas dog is perpetually, eternally happy. Srila Bhaktivinoda Thakura has therefore sung: vaisnava thakura tomara kukura baliya janaha more. In this way Bhaktivinoda Thakura offers to become a Vaisnavas dog. A dog always keeps himself at his masters door and does not allow any person unfavorable to the master to enter. Similarly, one should engage in the service of a Vaisnava and try to please him in every respect. Unless one does so, he does not make spiritual advancement. Apart from spiritual advancement, in the material world if one does not develop his qualities in goodness, he cannot be promoted to the higher planetary system. As confirmed by Bhagavad-gita (14.18):