Although they probably don't employ nicotine anymore using trained animals to guide sheep to a slaughterhouse is not a thing of the past. Another comment mentio

Although they probably don't employ nicotine anymore using trained animals to guide sheep to a slaughterhouse is not a thing of the past. Another comment mentions Temple Grandin. This video of hers showcases the use of leader sheep in a short clip (WARNING: graphic content): https://www.youtube.com/watch?v=BoB3tf9Q2AA&t=155 https://www.youtube.com/watch?v=BoB3tf9Q2AA&t=155