Short story, the Diamond Dogs are having a hard time finding Gems legit and they didn’t have any luck finding Unicorns to capture so one of them, Spot the Diamond Dog, decides to go out and actually attempt to rob Gem’s instead from shops and museum’s. Meanwhile, Thunderlane just got applied to be a Equestrian Guard and his 1st job is to patrol around the streets where he would spot Spot:P
 
Doesn’t take long for him to get caught though and of course the Equestria Guards including Thunderlane came to arrest him.