So this version of Krypto is basically a simulation, not the real thing, right?
I will quote from the
http://www.supermanhomepage.comBibbo Bibboski saved this lone puppy from a litter discarded by a woman on the docks of Metropolis. Since the young pup was the only survivor of his litter, Bibbo decided to name the puppy Krypton. Bibbo ordered a nametag for Krypton only to find that the proprietor only allowed six letters per tag. K-R-Y-P-T-O Disgusted by the man's attempts to swindle further money from his pocket, he took the tag as it was and decided on the name Krypto.
Recently on Superman's return to Krypton through the mysterious Phantom Zone, we learn that Krypto was a dog that belonged to the House of El. Superman recalled the animals name as 'Krypto'. On their return from Krypton through the Phantom Zone, Krypto returned with them. Under the yellow sun this dog has powers and abilities far beyond those of an ordinary K-9.
Contained within Lois and Clark's apartment, Krypto soon became restless, tearing up the place. So Superman took Krypto out for a fly. During their outing two meta-human criminals escape prison with the help of their crooked Attorney... but with Krypto's help, Superman captures them (MOS #112).
However on his next adventure Krypto was a little too successful, almost killing Mongul in a tussle between Mongul, his sister Mongal and Superman. So Superman confines Krypto to the Fortress of Solitude where he designates one of his Superman Robots to take care of the Superdog (SUP #170).
First Appearance (as Bibbo's dog): AOS #501 (Late June 1993)
First Appearance (as Kryptonian Dog): SUP #167 (April 2001)