What are some reason why you shouldn't euthanize animals?

Animal euthanasia is wrong because it is not natural. When an animal dies, (naturally), it goes through a process in which it's soul leaves it's body. The animal will be harmed if that natural process is suddenly ended. Besides, it is God that makes the decision of when the animal dies, not us. Have any of the prophets said to kill? An animal's life should not be taken from it. Also, we should not do something that upsets us. Natural death, however, will occur anyway at some point. Animals should be cared for until the last second of their lives. If they are in pain, they should be given pain killers. I hope this helps, and that we can end all euthanasia some day! :)