The Fire and Rescue Service deployed its inshore rescue boat at about 7.30 pm following reports that people had gone into the water off the south coast.
On arrival at the scene, the crew found all three were out of the sea but suffering the effects of hypothermia. They were later treated by paramedics.
The dog made its own way back to land and is safe and well.
In a statement, the Fire and Rescue Service said. ‘The weather conditions were such that simply being on the beach caused fears over safety due to the high tides, strong winds and heavy swell.
‘In total one inshore rescue boat and towing vehicle, one fire appliance, an ambulance crew and the States police attended this incident.’
They added: ‘Jersey Fire and Rescue would like to urge all Islanders to avoid coastal beaches, slipways and cliff paths during high winds and storm conditions.
‘If family pets become at risk of harm at sea please contact the emergency services and do not enter the water for any reason.’
The service have not stated where on the south coast the incident happened.
Meanwhile, a commercial vessel lost two ten-person life rafts between Noirmont and the west coast on Friday night.
In a Facebook post, Jersey Coastguard said: ‘They will have inflated and are orange and black in colour. If you see them please call us on 01534 447705 and we will verify they are the missing rafts and arrange their recovery.’
