Bizarro-Krypto
From superman.nu: Supermanica
Bizarro-Krypto
In June 1961, Superboy and Krypto crash through the time barrier, arriving from the past and landing on the Bizarro world, Htrae. They are captured by Bizarros, and a duplicator ray is immediately used to make an imperfect duplicate of Krypto. "Bizarro-Krypto," as the duplicate is henceforth called, is invulnerable and can talk to other animals, including Krypto himself (Adv No. 286/3: "The Shame of the Bizarro Family"). Like other Bizarros, however, he is vulnerable to Blue Kryptonite (Adv No. 294/2, Mar 1962: "Halloween Pranks of the Bizarro-Supermen").