Karlin gave great advice! You can do this too. We trained a recall with the 2 person cookie game. Each of us had a supply of treats. One person calls the dog (after training name recognition) using (name) come and C/T when the dog responds. Then the other person calls the dog and C/Ts. We gradually increase the distance between the 2 people. My DH stands 5 rooms away eventually and the dog runs back and forth when called. We also trained come with a hand signal. Comes in handy at the dog park when they can't really hear us. Your puppy is still young and will get it with consistency! We still repeat the recall exercise several times a week for each dog so they keep a strong response.
Molly and Murphy (tri), Katie (ruby), Casey (B/T),Spike the wonder pup (tri), Suzie (tri) and Penny (blen)