There's a lot to celebrate in the Ohtani household ... 'cause Shohei's famous pooch, Decoy, has made another trip around the sun ... and the Dodgers superstar commemorated the big birthday with an adorable tribute!!
The three-time MVP -- who has quite the stuffed trophy case -- gave his four-legged friend some hardware of his own ... by gifting him a "Most Valuable Dog" plaque.
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Decoy also got flowers and a number two balloon for his little pawty.