"Shipping Wars" star Roy Garber's beloved cat won't be a casualty in the wake of the his death ... TMZ has learned it's already en route to a home filled with other cute creatures.

Garber's cat Muffy was a fixture on the show ...  he refused to travel without her.  So it's no surprise ... the friendly feline was at Roy's side  when he passed away last week ... according to his girlfriend.

We're told Texas authorities got in touch with Roy's family and made arrangements to ship the cat back to Roy's home state of New Hampshire to live with his mom.

As we previously reported ... Roy died Friday after suffering a heart attack.