To keep them small, scientists artificially "turned off" a growth hormone receptor gene, stunting their size.
The new pigs will be only about 30 pounds at most, and will cost about $1,600. The company even plans to allow buyers to "customize" their new pet by choosing the color and pattern of his or her coat.
"Teacup" pigs are often kept small through inbreeding, which is its own type of genetic modification, or by keeping piglets permanently malnourished. These new designer pigs are being kept small because of work that's happening in a laboratory. Either way, the results are the same - more little pigs being sold to families who may or may not be able to properly care for them.
While these new pigs won't grow to the same sizes as potbellied pigs sold as "minis," they'll still have the same piggy behaviors, like rooting and digging, that make keeping a pet pig challenging for unprepared owners.
In addition, these lab-grown pigs may have unforeseen medical problems. "What happens down the road when these animals need care?" Crystal Kim-Han, who runs a rescue for abandoned pigs, told Nature.