I highly recommend the work of Temple Grandin in developing ways to raise and handle animals humanely on the way to the moment of slaughtering. She published a popular book just last year which summarizes some of her observations, conclusions, and work. I’m in the middle of reading it: Animals Make Us Human: Creating the Best Life for Animals.
Grandin talks about industrial practices, what they could be and should be, and the need for constant training, reinforcement, and monitoring to keep people from reverting to their old, cruel ways of handling animals. I was surprised to find that McDonald’s and Wendy’s audit their suppliers, who must come up to humane handling standards to remain suppliers.
For both pets and livestock, she talks about not distressing animals and meeting their instinctive needs.