No-pull harness slipping off Weimaraner? Try this

A harness slipping off every single walk is a real safety problem, not just an annoyance — and it's a very common issue with Weimaraners specifically. They have that deep, narrow chest and a tuck behind the shoulders that standard harness shapes just aren't built for. The most effective tools for lead pulling are no-pull harnesses and head collars, but fit is everything, and off-the-shelf sizes rarely work on this breed. To point you in the right direction: how strong is the pulling — manageable nuisance or genuinely hard to hold? And have you tried a head collar or just harnesses so far?

That forward slip is exactly what happens when there's not enough girth depth to anchor the harness back. The chest strap rides up and the whole thing migrates. Given that the pulling is reactive and genuinely hard to hold, you need something that stays put under real load. Before I give you a firm recommendation — does he have any neck or back issues, and is he okay with things going over his head?

Good — that opens up the best option for this situation. I'd go with the Perfect Fit modular harness. It's built in three separate pieces — front, girth, and back — that you size independently, which is exactly what a Weimaraner needs. You can get the girth piece snug enough to actually stay behind the shoulders while keeping the front piece proportioned for a narrow chest. It has a front D-ring for no-pull steering, and because it's not a one-piece mould it doesn't shift under load the way standard harnesses do. It's made by a small UK company, widely available on Amazon UK, and it's the harness most Weimaraner owners land on after going through the same carousel of ill-fitting alternatives you've been through.

It's more involved than a standard harness but the instructions are genuinely clear, and because each section adjusts independently you can keep tweaking until it's right rather than being stuck with one fixed shape. Measure the girth — the widest part of the ribcage just behind the front legs — and the chest width separately, and use Perfect Fit's own size guide rather than guessing. The girth piece is the most critical one on a Weimaraner; it needs to sit snug enough that it can't migrate forward. Most people get a usable fit on the first try and then fine-tune over the first few walks.

That's the right move. One last tip: clip the lead to the front ring for your walks for now — it gives you steering control so the pulling loses its payoff, which is what actually starts to change the behaviour over time. Good luck with it.