Tom Hanks's Dog Dies
01/20/2012 AT 07:00 AM EST
"Deep brown eyes, noble demeanor, finest dog ever," Hanks wrote on his WhoSay page, sharing a photo of Monty on a rocky slope.
Hanks, who does not update frequently and who had not mentioned Monty in the past, clearly must have felt the loss.
"A sad day," his Tweet continues. "Goodbye Big Boy."