Right or wrong?

Humans' mind are complicated. Sometimes in this world, we cant actually define what is right and what is wrong. For me it might right, but for you it might wrong. We just cant judge a thing rationally. Today i just read an email. It is about dog butchery. As i go through the email, i start thinking that why are people sending this email to me? Is that they want us to protect the dog and call people to stop killing and eating dog? In the email it consist of the picture of how the dog being kill. First thing went into my mind is, what about the chicken, pig, beef, fish and lamb that we consume? Isn't that this animal also having the same fate like the dog? Actually, we ask people to stop that act is just because the dog is cute and are consider as man's best friend. There is no big different. It is just we seldom heard that people eat dog but it is quite common i guess in China. Besides that, i have heard about in north world, some are eating the child. This is due to their family financing and the condition. Even though as we the normal human to think about it, this was definitely wrong and unethical! However, for them this is ethic. Because the whether are cold and it is difficult for them to have more than one child. Therefore, in order to support their family and to survive, they just kill the new born baby. Now i am thinking, human thinking are just weird and sometimes we cant even determine it is right? Or wrong?