Found this interesting article on the breed. Apparently they outcrossed back to rat terriers to solve the inbred problem aha has some other cool info too 
https://www.dogster.com/lifestyle/get-to-know-the-american-hairless-terrier-dare-to-go-bare-or-not

https://www.dogster.com/lifestyle/get-to-know-the-american-hairless-terrier-dare-to-go-bare-or-not