Merton becomes a trusted member of Krypto's rescue team.
Merton joins the shelter pets who agree to help Krypto, and later participates in rescuing the Justice League.
They are fellow members of the super-pet group.
Merton and Chip escape the burning shelter with the other newly powered shelter animals and work together in the later rescue effort.
The available plot confirms League adoption of shelter pets, though it does not assign this specific pair.
In the aftermath, the plot states that the shelter pets are adopted by members of the Justice League, including the named adoption assignments.
Explore the full interactive character relationship map of DC League of Super-Pets