If you’ve ever been to Disneyland, you’ve probably run across several hidden Mickeys without even knowing it. That’s the purpose of hidden Mickeys: to hide in plain sight. You don’t get any rewards for discovering these real-life easter eggs, so there’s no reason to keep your eyes peeled for them.
But this person came across a hidden Mickey in the most unusual place. This rope factory apparently produces a rope with Mickey pictures inside of the outer woven fibers. When untangled (perhaps your dog chewed on the rope), you can see the hidden surprise. What’s weird is that, according to the OP, the rope manufacturer had no affiliation with Disney.