You know, you don't really get a good feel of Luffy using Haki on that cow/yak in the manga version. The anime makes it quite obvious that something odd is happening there. Obviously though, Luffy had no idea he did anything.
This reminds me of what Shanks did to that sea monster when he saved Luffy as a child. I guess this confirms that Shanks is probably a Haki user even back then. He also showed that ability when he went to talk to White Beard to try and get him to call back Ace.
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