Through his own evil thoughts and actions, man makes himself impure. There is no strict rule in Buddhism that the followers of the Buddha should not take fish and meat. The only advice given by the Buddha is that they should not be involved in killing intentionally or they should not ask others to kill any living being for them. However, those who take vegetable food and abstain from animal flesh are praiseworthy. Though the Buddha did not advocate vegetarianism for the monks, He did advise the monks to avoid taking ten kinds of meat for their self respect and protection.
Some animals attack people when they smell the flesh of their own kind.
When the Buddha was asked to introduce vegetarianism amongst His disciples, the Buddha refused to do so. As Buddhism is a free religion, His advice was to leave the decision regarding vegetarianism to the individual disciple. It clearly shows that the Buddha had not considered this as a very important religious observance. The Buddha did not mention anything about vegetarianism for the lay Buddhists in His Teaching. Lord, do those who say animals are slaughtered on purpose for the recluse Gotama, and the recluse Gotama knowingly eats the meat killed on purpose for.