Tami had swum across the lake in Llanberis, its owner said.
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A dog is believed to have swum through treacherous currents in the Menai Strait in a 12-mile journey to get back to its owners.
Nine-year-old Tami had run away from her walker in a forest near Llanddwyn Island, Anglesey on Tuesday, 31 July.
The cocker spaniel then spent four days finding its way home to its owners in Caernarfon, Gwynedd, while they mounted a search across the two counties.
Owner Dilys Griffiths said Tami's "sixth sense" had got it home.
Mrs Griffiths and family friend Jim Crosby, who had been walking Tami when she disappeared, had put posters around shops and pubs and an advert in the Daily Post newspaper appealing for information on the dog.
Mrs Griffiths, who works in the X-ray department of Ysbyty Gwynedd, said she received several calls from people who had spotted the dog.
She told the Daily Post that after a second call saying that the dog had been spotted on the cycle path in Caernarfon, her family went straight down there and found Tami on Saturday.
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Speaking to other people, dogs can find their way back home when they're lost - it's almost like a sixth sense
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"She went mad when she saw us - we were over the moon. I just couldn't believe it," said Mrs Griffiths, a mother of three.
"Her coat was quite salty, but she was okay. The vet has checked her out and she is fine."
It is believed Tami swum the Menai Strait to the area around Y Felinheli, despite strong currents.
Mrs Griffiths said Tami was a strong swimmer having previously swum across the lake at Llanberis, Gwynedd.
"Speaking to other people, dogs can find their way back home when they're lost - it's almost like a sixth sense," she told the Daily Post.