Best harness for growing Labrador puppy

A 5-month-old Labrador is basically a harness-eating machine — they can jump a full size in a matter of weeks, so buying something too fitted right now is a waste of money. Not all no-pull harnesses are equal: front-clip designs work well for most dogs, but for strong pullers a dual-clip or head collar is often more effective, and fit is critical for any of them to work. To point you in the right direction — how much does your pup weigh now, roughly, and would you say the pulling is light and excitable or already pretty determined?

18kg at five months means he'll probably land somewhere between 28 and 35kg as an adult — that's a big range to shop across. The main thing you need is a harness with a genuinely wide chest and girth adjustment, a front-clip ring to redirect the pulling, and ideally a back-clip too so you have options as his training progresses. Has he had much lead training at all yet, or is this pretty much the starting point?

That's exactly the right way to think about it. My recommendation is the Ruffwear Front Range Harness. It has five adjustment points — chest, girth, and across the back — so it genuinely accommodates a Lab from adolescent to fully grown without becoming useless halfway through. It has both a front-clip and a back-clip, which matters because as his training improves you'll want the back option for calmer walks. The padding is substantial so it won't rub during the long walks Labs need, and the build quality means it'll last through the chewing-adjacent chaos of the next 12 months. Size Large should take him through the growth curve comfortably — just refit the straps every few weeks as he fills out.

Honest answer: it won't stop pulling on its own, but it changes the physics in your favour. When he pulls forward and the lead is clipped at the chest, the tension turns his body sideways toward you instead of letting him drive forward like a freight train. That interruption is usually enough to break the momentum and gives you the moment to redirect him. Paired with consistent loose-lead training — rewarding him for staying close — most Labs show real improvement within a few weeks. The harness is a training aid, not a magic fix, but it's the right tool for where you are right now.

Good choice. When it arrives, fit it so you can slide two fingers under every strap — snug but not tight. Check the fit again every two to three weeks because he will change shape noticeably over the next six months. The front-clip ring should sit flat on his chest, not pulling to one side. You're in a good window to get this established now before he hits full adolescent strength around 8 to 10 months — Labs that age can be genuinely powerful. Good luck with him.