The Field family reunited: Ethan, 10, mum Amber with Luna, and Riley, 8.

Luna, the earthquake cat, has finally made it home.

The black and white, green-eyed moggy was lost in a mix-up at a Christchurch cattery, and has returned home to her owners two years after going missing.

"I am so happy she is home," said owner Amber Field.

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"The kids are ecstatic.

"It was a bit unreal," she said.

Amber said by now the family did not expect to get the family cat back.

"Shes had it rough and is a very sore kitty, but shes purring and smooching and seems happy to be home too."

The cat – born on the day of the February 2011 Canterbury earthquake – was picked up by the wrong family at a Christchurch cattery in November 2014, while the Field family were going through earthquake repairs to their home.

Luna ran away from the new family and despite their and the cattery's efforts to find the cat, Luna was gone.

Last Wednesday, Amber received a call from a veterinarian from At the Vets on Brougham St saying a stray cat was identified as Luna by its microchip.

"A little old lady had bought in a stray cat she had been feeding for a couple of months.

"She was limping and sore... She'd obviously been fighting and scrapping," Field said.

Luna has been brought back home and now lives in the spare room in her "safe space" away from the other pets.

"She wasn't the friendliest cat before... she's pretty timid still.

"We've still got her sister Jet and another cat Dusty after we lost her and he's almost two now, so he's not happy about it," she said.

Neva, the Fields' 14-year-old Golden Retriever, "hasn't even batted an eyelid" with Luna's return, Field said.

Last Thursday, the front door was left open and Luna got out.

Riley went to school crying thinking he would never see Luna again. She reappeared in the spare room the next day.

"She knows exactly where she needs to be."

Amber said after the ordeal, it showed that getting your cat microchipped was "definitely worth it".