A dog and its owner have been tearfully reunited after they became parted four months ago, 700 kms apart.

The reunion happened on the first day that South Australian councils were able to look up microchip records from other municipalities.

Ten-year-old miniature fox terrier Rosa was reunited on Tuesday with her owner, Margie Sheppard, in Stirling, in the Adelaide Hills.

Rosa disappeared in January while Ms Sheppard and her husband, Andrew, were on holiday in Sceale Bay, on the Eyre Peninsula, a 700 kilometre drive from Adelaide.

They searched for Rosa over the next four days as they stayed in the small remote town, but could not find their precious pet.

She was found on Sunday, wandering around the Big Rocking Horse car park in Gumeracha, about 40 kilometres north-east of Adelaide.

She was brought to the Woodside Veterinary Clinic, which could not find a microchip on her.

They handed her over to Adelaide Hills Council ranger Marc Le Brun on Monday afternoon.

He was able to find and scan Rosa’s microchip and let Ms Sheppard know that Rosa had been found.

She said it was “unreal” to see Rosa again.