I suspect you may have already have seen this, but just in case, I'm hooking you up. Are you one of those people that think of casts as the sly, evil ones? Well, either way, THIS time the pranking is done by the canine of the species. More after the jump.

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So you think dogs are mellow and trustworthy?  Then I'm going to introduce you to a dog with a mean streak (about as mean as a older brother or something).  Keep watching until the end, and I'm betting you'll watch it over again.  Here you go dog and cat lovers: