One that really helped me (but all dogs are different, and there's many ideas to try) was where Kikopup demos how she stops, and calls/coaxes dog
back to her. THAT really seemed to help *my* dog reset his brain/snap out of pulling.
Yes, yes, Buddy did begin pulling again in a few more feet!! Sure he did!!


The world is full of great sights and smells, let's move forward! Let's GO!

I don't know how long it took to get around the block, but, it took a while.

and sometimes, out of sheer boredom, i'd mix it up with some sudden changes in other direction.
but, mostly, i just stopped each time, and coaxed him
back to me. Not nonstop coaxing, but like kikopup did, and just coaxed him back to me. Zero forward movement til Buddy returned back to me.
Buddy having to listen to me, and come back to me and refocusing on me seemed to help Buddy to snap out of being a pull monster...and overtime, he got better, and came to understand, "My pulling gets me nowhere."
Jackie's idea of asking for eye contact is good too.
But you will have to be consistent. Everytime Seamus gets to pull you to a mailbox, or pull you over to this tree here, etc etc, YOU lose. Seamus is being rewarded for pulling.
See, that IS THE HARD PART, imo, of loose leash training.
The more consistent you are-----------the faster Seamus will give up pullling.

and
EVERYONE who walks Seamus HAS TO BE ON BOARD with this, and not allow Seamus to pull---------- mom, dad, brother,Auntie Sue, just
everyone. If YOU are working hard to teach Seamus, "Pulling gets you NOTHING." but dad is letting Seamus drag him down the street,
your work will be doubley hard.
new rule: If Seamus pulls, he does not win.
You can freeze and wait til leash is loose,
You can change to opposite direction
You can call/coax him back to you
You can ask for eye contact, like Jackie says,
You can try any of the other ideas in the videoS, (like how to properly reward dog when he IS doing it right, giving him treat behind your knee, or toss it and you change directions, etc)
long long long list of things to try,
but Seamus does not "win" by pulling,
and every time he DOES get to pull you and move fwd, he IS being rewarded for pulling.
but, you can experiment around with all the methods, til you find one
you are comfortable with, that will work for
your dog.