Krypto #145: The New Supergirl's Dog

From: Superman #197-198, Superman/Batman Secret Files and Origins #1, Superman/Batman #5 (November 2003 - February 2004)

Look, Krypto can tell when you're a good sort. It has a very distinctive smell. Presumably. So no surprise that he would take to Cir-El AKA Cheryl Kent AKA 2003-2004's Supergirl. Unlike the "proper" Supergirl, she's a dog person.

It lends credibility to her claim that she is Superman's biological daughter, but though a dead ringer for Laurel Kent, she'll of course be outed as a cloning(ish) experiment, and so it goes. Doesn't mean the Dog of Steel doesn't feel protective of her.

Krypto appears in connection with Cir-El in a number of books including Superman #197-198, the Superman/Batman Secret Files...

...and Batman/Superman #5:

Oh ouch! The Superman Family doesn't take the dog out of the Fortress of Solitude, but when it does, it leaves a mark!