Grub is not a normal cat. He has a genetic disorder that's quite rare in cats, so rare that medical specialists are studying him to learn about it. You might imagine that it's less rare than they know, because most cats with mucopolysaccharidosis wouldn't survive long enough to be properly diagnosed.
Stephanie took Grub in as a foster cat through the rescue organization Good Mews in Georgia. She and her family fell for the kitten, and immediately knew he was now in his forever home, well before his diagnosis. Grub can get around, but he can't run or jump and has various special needs, in addition to looking different from the average house cat. But he's a calm and affectionate kitten, and relates well to his caregivers. Grub is also very much loved by his humans, who want to make the most of the time he has. You can follow Grub's progress at Instagram.