Vedic literature are meant for the human being and not for the cats and dogs. The cats and dogs can kill their eatable animals, and for that there is no question of sin on their part. But if a man kills an animal for the satisfaction of his uncontrolled taste, he must be responsible for breaking the laws of nature. And in the Bhagavad-gītā it is clearly explained that there are three kinds of activities according to the different modes of nature: the activities of goodness, the activities of passion, the activities of ignorance. Similarly, there are three kinds of eatables also: eatables in goodness, eatables on passion, eatables on ignorance. They're all clearly described, and if we properly utilize the instructions of the Bhagavad-gītā, then our whole life will become purified and ultimately we shall (be) able to reach the destination. Yad gatvā na nivartante tad dhāma paramaṁ mama (BG 15.6).
That information is given in the Bhagavad-gītā, that beyond this material sky, there is another spiritual sky; that is called sanātana sky. In this sky, this covered sky, we find everything temporary. It is manifested, it stays for some time, gives us some by-product, and then it becomes dwindling, and then vanishes. That is the law of this material world. You take this body, you take a fruit or anything what is created here, it has got its annihilation at the end. So beyond this temporary world there is another world for which the information is there, that paras tasmāt tu bhāvaḥ anyaḥ (BG 8.20). There is another nature which is eternal, sanātana, which is eternal.