it's going to be harder to back track what has already been taught. That being out on a leash in public is about the other dogs. Dealing with a pup who needs to learn staying on task first around other people and animals. Spending the time to go back to basics of working first with no expectation of interacting. Once you get a good work ethic first then a reward can be you give the command to be release to go meet or play. As far as being let loose and not going after the one Dog (Shiba) the one dog they can win at .. be ahead of the pup .. the moment the pup starts going in that direction physically or visually you (out-recall).. the pup back to your side. If they can't recall then they not ready to be let loose where they could cause long term emotional harm that may lead to changes in their behavior to other dogs.. to someones dog..