Portia could barely walk and had become “very depressed” before being moved from her small flat in Manchester.

She is now recovering and losing weight at Whitegate Animal Sanctuary in Wirral, Merseyside, the BBC reported.

Jill Jolly from the sanctuary said: “She could barely walk, we had to roll her to get her up. She would spend up to 48 hour lying in bed, having to be hand fed, she was in a lot of pain.

“It was almost as though she had shut down.”

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At her heaviest, Portia weighed in at 26 stone (165kg), three times her healthy weight.

Portia is now on a pet-friendly diet, Ms Jolly added.

She added: “With time, love, care and patience we’ve managed to basically get her back introduced to being a pig.”