I want to say something about slaughterhouses.
Cutting the throat of an animal will kill it in less then 30 seconds. It will. It does, and for more then 15 of those seconds, the animal is already unconcious.
This is after being shot with a captive bolt gun, which will almost certainly kill it. It is like being shot in the head.
If a slaughterhouse abuses it's animals, they stress. Stressed animals have terrible meat quality, and the slaughterhouse loses money.
Search 'The glass walls project by Temple Grandin' (Warning for animal gore)
It shows and explains the process behind slaughterhouses and how they work.
Keep in mind ALF, ELF, PETA, and HSOA Are all BAD sources. Earthlings, and documentaries filmed by Peta or any of the above organizations, are often filled with scenes the people involved have out-right admitted to being paid to do, for the sake of the video. It's sick.
Circuses are terrible for animals. Look at them. Do they look happy? Do the big cats with snarls on their faces, ears flattened, and lashing tails look like they benefit? How about the tigers bred to live in little cages their whole lives? Terrible. It's just as bad as white tigers (Who are horribly inbred and unhealthy, same with ligers)
Orcas and Dolphins should never be kept in captivity. Orcas especially. At least, not like they are now. It's sick, sick, sick, and I can go into much more detail on this subject if needed.
As for fur farming. Keep in mind an animal missing or with patchy fur equals money loss for the people running it. The animals are killed quickly and painlessly. They're fed amazing diets to keep their fur in it's best condition, and often have room and stimulation to avoid pacing or chewing, which ruins their pelts.
If zoos are accredited and take good care of their animals, I see no reason why they're cruel. They educate people. They dispel myths about how 'big cats might make good pets' and more. This is not the same as a road-side zoo, or the T.I.G.E.R.S. Facility (Which is terrible).
Not well educated about horse racing.
Animal fighting is cruel. Plain and simple. That's it. No debate. Why.