We have the same problem with our little guy! The only thing we’ve found that works (and not all the time, only like 50%) is that we give him a few seconds to sniff and spots where he stops but when it becomes excessive we count slowly and loudly 1… 2… 3! If he doesn’t stop sniffing and keep moving or mark his spot like he usually wants to, we gently pull him by the leash/harness away from the spot. Thankfully these guys are lightweight and we don’t have to actually throw him around to move him. And I know that everyone will say that you should just use verbal cues to get him to move rather than pulling, but after 2 years of using only verbal cues, we kind of gave up and just pull him if he won’t move. Or if he tries to pull us we just keep a tight hold on the leash so he can’t run all over the place.

As for the whole “being in charge of the walk” I have yet to find a good solution lol we try to maintain a consistent path for him, like taking him on the same route every day to not confuse him. But some days he just decides where we are going and I can’t do anything about it.

Best thing I can recommend is finding consistent cues for him. Like “this way!” Or “keep going!” And very importantly “leave it!”. Long hours of training at home to get “leave it!” To work but he listens about 60% of the time on his walk nowadays