A woman and her dog who were cut off from the shore at Sandymount Strand by the incoming tide were rescued by the RNLI on Sunday.
Heroic volunteers raced to the scene after they were alerted by the Irish Coast Guard.
The woman and her dog were forced to stand on a sandbank while the tide surrounded them.
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Members of the RNLI who are based at Dun Laoghaire station launched the lifeboat within 10 minutes of receiving the emergency call.
The lifeboat was helmed by Alan Keville and two crew members onboard Moselle Hogan and Andrew Sykes.
The woman and the dog were rescued and brought to the beach at Poolbeg where they were met by the Coast Guard.
Dun Laoghaire RNLI Helm Alan Keville said: "We would like to commend the dog walker for doing the right thing by calling 999 and raising the alarm immediately.
"Time is always of the essence in these situations.
"We would remind visitors to the coast to always be aware of local tide times before planning a walk.
"The tide comes in and out twice in each 24-hour period and while tide times can be predicted, they can also vary at each location and change daily.
“A beach or coastal area may appear a safe place for a walk but an incoming tide can quickly leave you stranded.”
Around 95% of the crucial service’s workforce are unpaid volunteers who give up hundreds of hours each year to train and carry out precarious sea rescues. Most balance their RNLI duties with full-time jobs.
Once an emergency call is logged, the Coast Guard will inform the RNLI, and depending on what the situation is, they will either launch their All-Weather Lifeboat or the Inshore Lifeboat. In certain circumstances, both will be used.
Last year alone, Dun Laoghaire launched its rescue boats on more than 90 callouts and logged hundreds of hours at sea, and helped in excess of 100 people.
The RNLI operates 46 lifeboat stations in Ireland.
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