If you eat meat, you must do something for the animal who has died. Otherwise, it is very sad, because that animal cherished its body more than any other being’s body. Just as you protect your body, that animal protected its body. Therefore, if you don’t at least pray for that animal, it is very sad, and you are very selfish.
It is terrible if you eat meat with a distracted mind and total attachment to your own happiness. You must at least recite a few mantras. If you don’t know the Mitukpa mantra or any of the other powerful mantras, you must at least recite OM MANI PADME HUM or the Medicine Buddha mantra. If you cannot recite one mala, recite half a mala, twenty one or seven manis or Medicine Buddha mantras. Recite the mantras with strong compassion, blow on the meat before you eat it, and make a strong dedication for that animal to immediately be liberated from the lower realms and to receive a good rebirth — a perfect human body or rebirth in a pure land……If you are not a vegetarian, if you do eat meat, reciting these mantras is unbelievably beneficial for the sentient being whose body you are eating. Otherwise, your eating the meat can become heavy negative karma and you are no different from a tiger or any other carnivore that lives on other animals. Even though you are not eating live animals, if you eat meat only with attachment and do not do anything to benefit the animal you are eating, you are not that different from a tiger.
OM KAMKANI KAMKANI ROTSANI ROTSANI TROTANI TROTANI TRASANI TRASANI PRATIHANA PRATIHANA SARVA KARMA PARAM PARA NIME SARVA SATTVA NANYTSA SOHA
~ Lama Zopa Rinpoche, Teachings from the Vajrasattva Retreat. Lama Yeshe Wisdom Archives: 2000