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There the dog Argos lay in the dung, all covered with dog ticks. Now, as he perceived that Odysseus had come close to him, he wagged his tail, and laid both his ears back; only he now no longer had the strength to move any closer to his master, who, watching him from a distance, without Eumaios noticing, secretly wiped a tear away […]. (17.300-305)
Odysseus's poor, tick-infested dog recognizes his long-lost master and feebly thumps his tail. Okay, it's not a 15-million-views-and-counting video on YouTube—but it still brings a tear to our eye.