It's the 30th anniversary of MUTTS and a new book's on the way to warm your heart.

Matchbox Twenty singer Rob Thomas and his wife Marisol Thomas teamed up with cartoonist Patrick McDonnell for the long-awaited story of the inspiring character Guard Dog timed in celebration of the beloved comic's milestone.

Breaking the Chain: The Guard Dog Story chronicles the tale of a chained dog longing for freedom. His character debuted in the MUTTS comic strip in 1995 and now, three decades later, the book culminates with his unchaining and adoption.

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"There's such a beautiful simplicity to all of the Mutt's comics," Thomas tells PEOPLE exclusively. "But at the bottom of everything, it's a very, very deep

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