Yup. Streaky was Supergirl's pet who ran into one of her experiments. That "Last Son of Krypton" thing wears a little thin when you figure he's got his cousin (Kara, Supergirl), his pet dog (sent off in an earlier experiment before Krypton exploded), the entire city of Kandor (thanks to criminal android Brainiac), all of the Kryptonians in the Phantom Zone and Survival Zone (thugs in the former, Superman's uncle Zor and Aunt in the latter), etc.
