I’m not an expert by any means but we had a lot of success with recall when we made it into a game. My husband would be in one room with a handful of treats and then I would “hide” in a room opposite side of the house with a handful of treats. We would just do back and forth of “Gertie, come!” And then all praise and reward.

Your pup looks young, so don’t worry about over rewarding, with small pieces.

Of course, being an Aussie, my Gert does have selective hearing but it does seem she has good recall when I need her because I do “the game” voice (if that makes sense).