I can't imagine this lasting very long but it's a pretty fun thing at the moment. After we discovered you can infinitely rename your companion pets my husband logged over to see if he could see it perfectly on his horde character. And you can, so have fun! :P
It provokes a lot of reaction if you go up to a horde, poke him and then rename your companion pet to like, "Hi [name]" and point to it. Once they figured out how to respond we had some funny conversations. Right click your companion pet to rename him and then summon it out. You have to close the pet menu for the name to load up.