Hi, Koby’s 5 months and walks nicely on collar and lead until we meet people, then the excitement kicks in (we have a boarding school in the village and often meet the pupils on walks and as he’s so young, they get excited to see him and vice versa). Training is on-going, but to stop the pulling and save his neck, I use the Premier Easy Walk harness which has a martingale loop (leads from the chest).