Superman #712 1:10

LOST BOY: A TALE OF KRYPTO THE SUPERDOG Superboy and Krypto play across the skies of Smallville. Superboy throws a frisbee, but Krypto breaks it with his teeth. Superboy gets a manhole cover and throws it for Krypto to catch.   Later, Krypto is lying on the entrance of the Kent house. Jonathan and Martha remark that Krypto has been quiet ever since he and Superboy fought Superboy-Prime. In the morning, Krypto flies to the Titans Tower but leaves before anyone can notice him.   He then flies to several places he and Superboy went to together, and later arrives at a destroyed structure in the Arctic. Using his x-ray vision and super smell, Krypto realizes that this was the place where Superboy died. Saddened, Krypto lets out a howl that is heard across the world.   Krypto flies across the world to find Superman, but he doesn't find him. Sad, Krypto flies to an asteroid and goes to sleep there, with the manhole cover Superboy used threw for him.