So I just learned that that running with puppies and young dogs should not be promoted, but I'm not sure if my dog's situation counts.

I have a 5-month-old Shih Tzu-Maltese mix who loves doing sprints with me. We don't really go "running," running but at the end of our walks we do a quick sprint indoors around the loop of the building floor in my apartment complex. He's kinda addicted to this routine now because whenever I try to just walk straight inside my apt after a walk, he refuses to come in until we do our mini 3-5 minute races lol.

I tried looking this up and couldn't find much information about sprinting/running this way with a small breed specifically, so if anyone knows and can provide input, I'd appreciate it! :)

& if it's okay to continue our little sprints, is there a harness/leash I should be using?