Reddit mentions of rabbitgoo Dog Harness, No-Pull Pet Harness with 2 Leash Clips, Adjustable Soft Padded Dog Vest, Reflective No-Choke Pet Oxford Vest with Easy Control Handle for Large Dogs, Black, L (Chest 20.5-36")

Body harness. You usually see them for small dogs, but they have them for all sizes - think what you see for sled dogs. You can thread a normal seatbelt through the center portion and if an accident occurs they are supported by the chest straps instead of just their necks.

Please do not use a collar for a pulling dog. She will strangle herself every time she pulls and the neck is an extremely sensitive area.

I can only recommend you what I am using with my 110 pounds Rottweiler which is this harness. It of course depends on the dog and I have to add that she is NOT a puller only when other dogs are around and she wants to play with them. But I can guarantee you that a border collie is not a strong dog. If it can hold my Rottweiler, it can definitely hold yours.

My dog has issues with strong pulling when overexcited, and I 100% recommend a harness over a neck-collar. The weight is much more evenly distributed, so I find it about 10x easier to control her when she's overexcited. This is the one I got, for reference:
https://www.amazon.com/Rabbitgoo-Harness-Adjustable-Reflective-Material/dp/B01M8JT6FT/ref=sr_1_1_sspa?s=pet-supplies&ie=UTF8&qid=1538512912&sr=1-1-spons&keywords=dog+harness&psc=1

I have this one off of Amazon and really like it. It has both front and back clips for the leash.

Hi! I got the harness from my mother in law but it is a Rabbitgoo No Pull Harness in a large! It's pretty nice! I think Bumi is about 45lbs (he's our lean boi) and there's still room for him to grow into it (he's 9mo). I like it a lot! I def recommend it.

Yeah I’m not a fan of teaching by discipline. My dogs actually have 3 different leads for walks, because things work for different types of dogs.

I’ve got one on a Gentle Leader. It’s pain free, and easy to use. The only downside was it rubbed the hair off one of my dogs, so we had to switch what he was on.

PetSafe Gentle Leader Head Collar with Training DVD, LARGE 60-130 LBS., BLACK https://www.amazon.com/dp/B00074L4W2/ref=cm_sw_r_cp_api_ArVJBbSYWZN8K

I’ve got another one on the Holy leader. For some reason he was able to just power through the gentle leader like it wasn’t even on, but the Holt seems to work as intended. Same concept of forcing the dog to turn and look at you if he pulls.

Holt Head Collar Black Size 3 https://www.amazon.com/dp/B005OCXVJG/ref=cm_sw_r_cp_api_1uVJBbW14C4QP

He third dog, the one who has his hair rubbed off, is on the RabitGoo harness. It has a leash attachment in the front, to prevent pulling, a handle to grab onto if needed, and a back leash attachment. They run a little big, so if he borders between sizes get the smaller one.

Rabbitgoo Dog Harness No-Pull Pet Harness Adjustable Outdoor Pet Vest 3M Reflective Oxford Material Vest for Dogs Easy Control for Small Medium Large Dogs (Black, L) https://www.amazon.com/dp/B01M8JT6FT/ref=cm_sw_r_cp_api_NxVJBb472BM7P

I also highly recommend the Primal Pet Gear training leash too. It’s easy on the hands and fits perfectly when my dogs are by my side. My dogs are bigger though, so I’m not sure if that makes a difference.

Primal Pet Gear Dog Leash 6ft Long - Traffic Padded Two Handle - Heavy Duty - Double Handles Lead Control Safety Training - Leashes Large Dogs Medium Dogs https://www.amazon.com/dp/B072144JB1/ref=cm_sw_r_cp_api_pzVJBbPNSC8YT

I’ll look for my notes and post!

Here is the no-pull harness I use.
Rabbitgoo Dog Harness No-Pull Pet Harness Adjustable Outdoor Pet Vest 3M Reflective Oxford Material Vest for Dogs Easy Control for Small Medium Large Dogs

Front clip harnesses are great, so are rear/back clip harnesses if the dog isn't a puller.

With the senior dog I'd go for a fairly solid back clip harness (like this, or this - if he's got sore joints at all (which is common for the breed) then a front clip harness could be painful as they basically turn the dog if it pulls. The solid harness will give you a good amount of control, and will also feel more comfortable for your new guy.

For your younger fella, a front clip harness and some classes on nice walking on a leash would be a good idea. I walk dogs 3-4 times a week, and I find that the dogs I walk with harnesses learn really quick. I use no corrections, just food and the 300 peck method.

this is similar to his

Could you link me that one? But i was looking online and found this one. Is it good?

There's also a knock off harness of the front range that is awesome! I've kept in on my pup for whole days consistently with no issues.

knock off one

Something like this is much safer for the dog's health. There are dozens of brands -- I'm not recommending any one in particular -- just pointing out a design flaw that's common in "no pull" harnesses.

Make sure the harness you use has a “Y-front”, these harnesses don’t put pressure on the dogs shoulders/joints and don’t cause them any umcomfort. You can use a Ruffwear harness or there are some cheaper alternatives that I’ll link below

ruffwear

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I do the exact same when descending mountains with my dude, clip on to the front and he'll just walk along side https://www.amazon.com/Rabbitgoo-Harness-Adjustable-Reflective-Material/dp/B01M8JT6FT/

Clip him on the back and he pulls like crazy

It is the rabbitgoo.

https://www.amazon.com/Rabbitgoo-Harness-Adjustable-Reflective-Material/dp/B01M8JT6FT/ref=mp_s_a_1_1_sspa?adgrpid=52858772581&hvadid=274871584217&hvdev=m&hvlocphy=1014250&hvnetw=g&hvpos=1t2&hvqmt=e&hvrand=1063962732027495227&hvtargid=aud-649564993678%3Akwd-314977557086&hydadcr=12163_10197799&keywords=rabbitgoo+dog+harness&qid=1564579150&s=gateway&sr=8-1-spons&psc=1

What kinda harness you got for two?

I have this leash for two that I really like.

But I have these harnesses, they are just ok. Think I might like those more.

Rabbitgoo Dog Harness