First appearance of the modern Krypto
Superman: the Man of Steel 111:
In Superman: the Man of Steel 111 (February 2001), Superman and Lois are still on Krypton and we see Krypto wear a cape along with everyone else!
by Mark Schultz and Doug Mahnke
Action Comics 776:
In Action Comics 776 (February 2001), Superman and Lois return to Earth. Unknown to them, Krypto is hot on their heels and follows them back!
by Joe Kelly and Kano
Clark and Lois are back in Metropolis - Ma Kent gives a super-cape to Krypto!
by Jeph Loeb and Ed McGuinness
Superman: the Man of Steel 112:
In Superman: the Man of Steel 112, Superman discovers the extent of Krypto's powers by playing fetch and other super-games with him. Krypto then helps Superman solve a case by using his super-tracking abilities.
by Mark Schultz, Yanick Paquette, and Olivier Coipel
Krypto defends Lois by attacking Mongul; banned to the Fortress of Solitude, where he is under the watchful eye of Super-Robot "Ned."
by Jeph Loeb and Dale Keown
Krypto's super-antics in the Fortress of Solitude; Krypto escapes to perform rescues and other super-deeds; Superman and Krypto.
by Joe Kelly and Pascual Ferry
In Batman 612 (April, 2003), Krypto stops the villainous Ivy from escaping!
by Jeph Loeb and Jim Lee