Sad news from Russell Wilson ... his beloved dog has died.
The Pittsburgh Steelers quarterback announced the heartbreaking update on his Instagram page just minutes ago ... revealing his Great Dane, Prince, passed away on Friday morning.
"I got you my rookie year," Russ said in an emotional note to his late pup, "& you have been a blessing to our family with so many memories, hugs, and kisses from our 4 kids and us.