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Thinking they had just purchased a micro-pig, Nigel Graham, 57, and wife Sam, 48, were delighted with the miniature animal when they brought her home in 2014.
However, they got the shock of their lives when she just kept growing and growing, now having gone from 70 pounds to a whopping 28 stone.
Not so micro any more, Grace now ploughs through £20 of food a week, and has taken over the whole bottom floor of their three-bedroom cottage in Malvern, Worcs after she point blank refused to sleep out in her sty.
She's a pig after our own hearts...
The spoilt hog even has her own pig-flap which Nigel cut into a side door to allow Grace to come and go as she pleases.
Property developer and dad-of-two Nigel said: "I got Grace as a birthday present for my Sam four years ago because she is allergic to cats and dogs.
"The place actually invite you down there to see mother and father and I met Grace who was two weeks old at the time and had to do a course on how to look after her.
"It's a very legitimate business. I went down there, I picked her up and held her and decided to get her.
"Her parents were about knee high, which is the actual size of a fully grown micro-pig.
"They were fed a couple of pig pellets a day, whereas Grace gets three big meals a day and treats.
"I think that's contributed to her size, really. Plus she get loads of exercise as well. So she is sturdy and powerful."
Grace is now also five feet long, and comes up to the waist of the average human.
Despite Nigel building her a bespoke pen with insulated floors and ceilings, the pampered pig sleeps on an orthopaedic mattress in the living room, and even joins them on the sofa when they're sat watching TV.
It takes a lot for Grace to muster the energy to go outside, as she's fond of her "creature comforts" and "likes to stay cosy".
However, Nigel added: "If it's a nice day she will follow me out of the house and obviously when she needs to go to the toilet to do a wee or poo. She will hold it in for 19 hours if it's raining.
"She won't do them in the house she's really good in that respect, she is toilet trained.
"She'll go down the bottom of the garden and she will whinge at the door if she is really dying for one. Pigs are really clean anyway."
Despite a full-sized pig being an unusual pet, Nigel said he wouldn't change her for the world.
"She's our pet and we love her and I class her as a third daughter to be honest. She's part of the family.
"It's great. She's not like a pig. It's no different than a dog or a cat, in fact she is cleaner than one of my daughters and shows me more love."
Having had Grace for five years, Nigel is now so in love with her that he's even pledged to give up bacon for good, despite the fact it used to be his favourite meat.
"We don't eat it anymore as it just wouldn't feel right," he explained.
Micro-pigs typically live for up to 18 years, while a regular sized one can live up to 20.
Is it weird we kinda want a full-sized porker of our own now?!
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