"Men who are like dogs, hogs, camels and asses praise those men who never listen to the transcendental pastimes of Lord Śrī Kṛṣṇa, the deliverer from evils." Purport by His Divine Grace A. C. Bhaktivedanta Swami Śrīla Prabhupāda: "The general mass of people, unless they are trained systematically for a higher standard of life in spiritual values, are no better than animals, and in this verse they have been particularly put on the level of the dogs, hogs, camels and asses. Modern university education practically prepares one to acquire a doggish mentality to accept the service of a greater master. Like the dogs, after finishing a so-called education, the so-called educated persons move from door to door with applications for some service, and mostly they are driven away, informed of no vacancy. As the dogs are negligible animals and serve the master faithfully for bits of bread, similarly, one serves a master faithfully without sufficient rewards.
"Persons who have no discrimination in the matter of foodstuff and who eat all sorts of rubbish are compared with the hogs. Hogs are very much attached to eating stools. So the stool is a kind of foodstuff for a particular type of animal. And even the stones are edible by a particular type of animal or bird. But the human being is not meant for eating everything and anything, save grains, vegetables, fruits, milk, sugar and so forth. Animal food is not meant for the human being. For chewing solid food, the human being has a particular type of teeth meant for cutting fruits and vegetables. The human being is endowed with two canine teeth as a concession for such persons who will eat animal food at any cost. It is known to everyone that one man's food is another man's poison. Human beings are expected to accept the remnant of food offered to Lord Śrī Kṛṣṇa, and the Lord accepts foodstuff from the categories of leaves, flowers, fruits, etc. (BG 9.26). No animal food is offered to the Lord, as prescribed by Vedic scriptures. Therefore, a human being is meant to eat a particular type of food. He should not imitate the animals to derive so-called vitamin values. Therefore, a person who has no discrimination in regard to eating is compared with the hogs.
"The camel is a kind of animal which takes pleasure in eating thorns. Similarly, a person who wants to enjoy family life or the worldly life of so-called enjoyment is compared with the camel. Materialistic life is full of thorns, so one should live only by the prescribed method of Vedic regulations, just to make the best use of a bad bargain. Life in the material world is maintained by sucking one's own blood. The central point of attraction for material enjoyment is sex life. To enjoy sex life is to suck one's own blood, and there is not much more to be explained in this connection. The camel also sucks its own blood while chewing the thorny twigs. The thorns the camel eats cut the tongue of the camel, and so blood begins to flow within the camel's mouth. The thorns, mixed with fresh blood, create a taste for the foolish camel, and so he enjoys the thorn-eating business with false pleasure. Similarly, the great business magnates, industrialists who work very hard to earn money by different ways and questionable means, eat the thorny result of their action mixed up with their own blood. Therefore the Bhāgavatam has situated these diseased fellows along with the camels.