When Superman is a boy, Krypto is always around but never appears when Superman is adult.
What is the reason that Krypto no longer appears?
1 Answer
There was no canonical tidy end, but he died in pre-Crisis Action Comics #583, via the Kryptonite Man:
This was a flashback/retcon, likely to address the lack[s] of closure. Assist to @KHW: "This version of Krypto (Earth-One), including all history and corresponding appearances, was erased from existence following the collapse of the Multiverse in the 1985-86 Crisis on Infinite Earths limited series and is now considered apocryphal." - from Krypto's Wikia article.
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1Perhaps it should also be mentioned that per Krypto's page "This version of Krypto (Earth-One), including all history and corresponding appearances, was erased from existence following the collapse of the Multiverse in the 1985-86 Crisis on Infinite Earths limited series and is now considered apocryphal."– K-H-WCommented May 10, 2013 at 3:52
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@KHW I thought 'non-canon' was enough. But yeah, sounds like a good idea. Commented May 10, 2013 at 3:53
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2Well, that's a.. bizarre issue.. Non-canon v.s. 'retro-actively deleted from history' by a canon occurrence... Said differently -- "It was canon, and now is non-canon by virtue of a change that occurred as part of the canon." Enough to make your head spin.... :)– K-H-WCommented May 10, 2013 at 22:15