It's A Dog's Life
Today was the day. For the first time, the sidekicks – excuse me, partners – would join their mentors on a journey to the Hall of Justice, the home of the famous Justice League. Wally couldn't be happier.
The young pup raced around Captain Cold listening to his Uncle taunt the ice imbecile. "Ice? Isn't that a bit cliché even for Captain Cold?" Flash yelled. Cold growled in frustration, and shot beams of ice at the circling speedsters. If dogs cold roll their eyes, Dog Flash would have. Normally, he would have enjoyed making his villains mad, but today was the day! He would finally get to see the Hall of Justice, and he would not be late (again)! Dog Flash stopped running in circles and raced toward the frozen foe. The man shot his gun directly at the pursuing pup, but DF performed a quick twisting maneuver to escape the full wrath of the cold gun's beam. He jumped up and grabbed Cold's gun out of his hands with his teeth. Before the villain could blink, he was sucker punched by the Flash.
"Calm down, DF," Flash told the red-haired lab. Dog Flash dropped the freeze ray in his mouth to growl at his mentor; seriously, the guy would chat it up with anyone: bystanders, the cops, even Cold! No, not today; today was the day! Dog Flash whined and tugged at the Flash's boot. "Okay, okay, boy! Let's go, then!" The two speedsters ran off, not knowing what was about to come next.
This story is basically if Kid Flash/Wally West was turned into a dog during the early days of his training. It would start off with the first mission (only with a dog with super speed instead of a human); then, after Miss Martian joins, the team finds out that Wally (the dog) was once a human, and they go on a quest to find a way to turn him back.
BONUS: Emotional Barry/Wally bonding (if he was turned back)
BONUS: Krypto the Superdog and Ace the Batdog playdates.