Blue Peter dog Lucy has died from cancer, aged 13.
The golden retriever was the seventh Blue Peter dog and had appeared beside 12 presenters across hundreds of shows.
A special part of Monday's show was dedicated to Lucy, with pictures of her through the years. She especially loved a yellow squeaky ball.
Lucy had appeared alongside boy band The Wanted, dressed up as a police officer, and had met famous people including the Queen and JK Rowling.
Presenter Helen Skelton said: "When you join Blue Peter you join a family and Lucy was a loyal and loving member of that family unit.
"I know the viewers will miss her as much as we already do."