"The pig was advertised as a mini on Craigslist, and he was small at the time, and then he grew," animal welfare worker Barbara Poe told KSHB. To 50 pounds in about seven months.
A worker at an animal welfare organization told KSHB that the pig's jump in size forced the owner to give the pig up.
"Getting an animal off Craigslist, in some situations, may not be the best idea because they're not giving you all you need to know," Poe told KSHB.
Like how long pigs can take to fully grow. Another woman's pig grew to 100 pounds over five years.
"She was a teacup, and, you know, I was told she was going to be 25 pounds," owner Ann Varner told KSHB.
Instead of getting rid of her pig, she opted for a bigger apartment. Still, she says breeders misled her.
"You need to understand that pigs, especially –– they can be 60 pounds or 300 pounds, and you don't know what you're getting until they are five years old," Varner told KSHB.
The woman says "education is the utmost important thing" and recommends visiting the site Mini Pig Info if you're thinking of getting a tiny pig.
Related: More pigs who live as pets:
Pigs as pets
Buyer beware: Craigslist sellers have been duping pet pig buyers
POOLESVILLE, MD - JANUARY 27: Terry Cummings pets Wee Wee the piglet at Poplar Spring Animal Sanctuary January 27, 2016 in Poolesville, Maryland. The Smith family rescued Wee Wee the piglet during winter storm Jonas and cared for him at their home for several days before bringing him to Poplar Spring Animal Animal Sanctuary. (Photo by Sara Kenigsberg/Getty Images)
MADRID, SPAIN - JANUARY 17: A man holds a pig in front of the San Anton Church in Madrid, Spain on Saint Anthony's day, dedicated to the animals by Spanish Christians on January 17, 2016. (Photo by Burak Akbulut/Anadolu Agency/Getty Images)
A pig is seen at a park in Mexico City on October 15, 2015. At first glance they might seem like small pudgy dogs, but they are really mini pigs being walked, the latest pet fashion and status symbol in Mexico City. AFP PHOTO / RONALDO SCHEMIDT (Photo credit should read RONALDO SCHEMIDT/AFP/Getty Images)
GUANGZHOU, CHINA - JULY 29: (CHINA OUT) A woman feeds a 100-kilogram pet pig on July 29, 2015 in Guangzhou, China. Miss Zhou bought a pet pig which was sold as a black small-eared pig by a pet store worker in June last year. However, the pig grew to 100-kilogram and was confirmed to be an ordinary pig a year later in July 2015 in Guangzhou. (Photo by ChinaFotoPress/ChinaFotoPress via Getty Images)
NORTH BERWICK, ME - JULY 2: Naomi Eves, 5, daughter of Speaker of the House Mark Eves, feeds their pet pig Wilbur in the yard of their North Berwick home, Thursday, July 2, 2015. (Photo by Gabe Souza/Portland Press Herald via Getty Images)
HESSE, GERMANY - APRIL: Orphaned piglet Elsa wears a jumper to keep her warm in April, 2015, in Dillenburg, Hesse, Germany. Orphaned wild boar piglets stalk a cat, play with a dog, snuffle at a horse and chase chickens in adorable photographs. Napping on a pillow, strutting in a blue pullover or cuddling with their human parents - these little piggies are living the life of riley.But young boars Wilma and Elsa were lost in the wild and facing death from hypothermia before being adopted by Werner and Angelika Schm?ing from Oberscheld, Germany. The familys bengal cat Leopold, and collie dog Ziva have become best friends with both piglets - who also play with the couples two Frisian horses. PHOTOGRAPH BY Animal Press / Barcroft Media (Photo credit should read Animal Press / Barcroft Media via Getty Images)
HESSE, GERMANY - APRIL: Orphaned piglet Wilma in April, 2015, in Dillenburg, Hesse, Germany. Orphaned wild boar piglets stalk a cat, play with a dog, snuffle at a horse and chase chickens in adorable photographs. Napping on a pillow, strutting in a blue pullover or cuddling with their human parents - these little piggies are living the life of riley.But young boars Wilma and Elsa were lost in the wild and facing death from hypothermia before being adopted by Werner and Angelika SchmÃ¤ing from Oberscheld, Germany. The familys bengal cat Leopold, and collie dog Ziva have become best friends with both piglets - who also play with the couples two Frisian horses.PHOTOGRAPH BY Animal Press / Barcroft Media (Photo credit should read Animal Press / Barcroft Media via Getty Images)
A pair of miniature pigs at Pennywell Farm in Devon, taken on April 8, 2014. (Photo by Hollie Latham/PhotoPlus Magazine via Getty Images)
CAMBRIDGESHIRE, UNITED KINGDOM - DECEMBER 17: *** EXCLUSIVE ** Micro pig Lady Gaga sits in a stocking on December 17, 2010 in Cambridgeshire, England. Miniature pigs have become the must have present for Christmas - with children across the country putting the tiny animals on their wish lists. And as tiny six-week old Lady Gaga snuggles up in her Christmas stocking and cuddles her furry pals it's easy to see why the cute little grunters have become so popular. But families are being warned that miniature pigs are for life - not just for Christmas. Micro Pig breeder Jane Croft - who owns Lady Gaga - said: 'A lot of people don't realise that miniature pigs need a lot of care and attention - you can't leave them alone by themselves. We've turned away a lot of last minute requests from people wanting to buy them as surprise Christmas presents. They can live up to 20 years so people need to realise they are a long term commitment before getting one as a Christmas present.' At four inches high and six inches long, tiny Gaga weighs little more than a bag of sugar at 1.5Kg. She can fit into a tiny Christmas stocking - and will even happily fall asleep inside. But within two years she will eventually grow to up to 13 inches tall and weigh up to 65lb. (Photo by Nick Obank / Barcroft Media / Getty Images)
CHRISTCHURCH, UNITED KINGDOM - APRIL 03: Six week old micro pigs inside the house in the arms of Jane Croft at Little Pig Farm on April 03, 2010 in Christchurch, Cambridgeshire, England. Micro pig and miniature pot bellied pig breeder Jane Croft provides a loving environment for the piglets for the first few weeks of their lives until they find a home. Sharing her home with her dog, Daisy, and house cat, Hector, the piglets eat, sleep and play together with her pets. Costing between GBP Â£550.00 and GBP Â£1,200.00, the intelligent animals like to keep exceptionally clean and love company. No larger than 18 inches tall when fully grown at 3 years old, the miniature breeds make such good pets their popularity is booming worldwide - even Harry Potter actor Rupert Grint, who plays Ron Weasley, visited Jane's farm to buy two micro-pigs for his sisters. (Photo by Mark Clifford/Barcroft Media/Getty Images)
NEW YORK - APRIL 1: Calvin the pig poses for photos at the 33rd annual Macy's Flower Show on April 1, 2007 in New York City. (Photo by Astrid Stawiarz/Getty Images)