I don't understand the recent "Save Krypto" thing that seems to be going around. Yeah, I love Krypto, but this isn't the first time that he "didn't survive" Krypton in the comics. The Byrne/Wolfman reboot in the '80s eliminated Krypto as well.
He eventually came back. Just like he will again down the line.
George Perez, while a fine human being and with some competent projects in the past, has never been considered a writer of particularly great note.
People who read the first few years of the Post-Crisis Wonder Woman
would beg to differ.