04/18/2011 at 03:00 PM EDT
Haylie Duff's dog Bentley has died, the star announced on Twitter today.
"Just said goodbye to my best friend," she Tweeted
, sharing a photo of her pet. "The BEST dog ever. Love you big, lil man."
Starting the Twitter hashtag #BennyBooBatz, Duff asked fans to send in photos of her beloved pooch, who passed away from old age. As did sister Hilary Duff, who similarly Tweeted
, "Had to say goodbye to a member of the team today. Guys please find pics of bentley and send to @hayliek would mean so much."
Retweeting some of the best photos she's received, Duff then thanked her nearly 147,000 Twitter followers for their support, writing
, "These r the times that twitter makes me so appreciative. Thanks for all the bentley pics. Love you all!"