The journalist was diagnosed with motor neurone disease in October.
Charlie Bird has given his followers a heartbreaking health update
Alongside an old video of him and his dog Tiger, he shared the news that his "voice is almost gone".
In the clip, the former RTÉ broadcaster can be heard singing 'happy birthday' to his pet at his family home.
"
Someone found this on Twitter recently," he wrote. "I put it up a few years ago. In a way, it is a stark reminder of how far I have now traveled.
https://twitter.com/charliebird49/status/1485928667087843328
"Today my voice is almost gone. But thankfully Tiger can still sing."
He added: "I will still be climbing Croagh Patrick on April 2nd."
Charlie previously revealed that Tiger had gotten him through some of the
darkest moments of his life.
His upcoming
Croagh Patrick climb will take place on 2 April. He will be raising funds for both Pieta and Irish Motor Neurone Disease Ireland.
Speaking about his motor neurone disease diagnosis, the 72-year-old said: "My motor neurone disease diagnosis was devastating but I have been overwhelmed by the support I have received from the general public
"This has been a source of strength for me.
"I want to use that outpouring of support to help other people and specifically those who are also suffering from this disease and those who are suffering from thoughts of suicide and self-harm."
Charlie will be climbing Croagh Patrick with the
help of his loved ones. He will be joined by Vicky Phelan, Matt Molly, Ryan Tubridy as well as other famous faces.
The public has also been encouraged to start their own fundraisers to support the charities close to Charlie's heart.
He has invited them to take part in their own 'Climb with Charlie’ on April 2nd. More information or a link to donate to the climb can be found
here.
