Streaky
From superman.nu: Supermanica
Streaky the Super-Cat
A mischievous feline pet of Linda Lee Danvers Supergirl, Streaky has on-again, off-again super-powers due to exposure to Krytonite X (a failed Krytonite antidote attempt by Supergirl).
Streaky is a member of the Legion of Super Pets.
His 30th Century descendant is named Whizzy.