Who is Argos and why is he significant in the Oddesey?

Argos is Odysseus' dog. He was a puppy when Odysseus left to fight and Troy. When Odysseus returned to his kingdom disguised as a beggar, he found that his dog was old and really dirty. Odysseus could not show affection to Argos or he would give his disguise away. But once Argos saw Odysseus, he thumped his tail and could barley lift his head because he was so old. He caught sight of Odysseus and painlessly died, for he was finally at peace because he saw his master again. It is a beautiful moment in the epic poem.