Best adjustable harness for Great Dane puppy

Good training tools amplify good technique — they don't replace it — but the right equipment genuinely matters, especially with a fast-growing giant breed. A Great Dane at four months is already a handful and will double down on size within weeks, so getting the harness choice right now saves money and hassle later. To point you well: what are you specifically working on — loose-lead walking, jumping, general manners? And what have you tried so far?

That's the Great Dane trap — they grow so fast in these early months that a fixed-size harness becomes a waste of money almost immediately. The supermarket ones also tend to have a single chest strap with minimal adjustment, which means poor fit and poor control. Before I suggest anything: how big is he right now roughly — chest girth if you know it, or just his weight? That'll tell me whether you're at the smaller end of medium sizing or already nudging large.

Right, so at 20kg he's probably sitting around 55–65cm chest girth, and he's going to blow through sizes quickly. Here's what I'd recommend: the Rabbitgoo No-Pull Dog Harness. It's around £20–25 on Amazon UK depending on the size, which makes it one of the most affordable harnesses with genuine adjustability — five adjustment points on the large size, which gives you real scope to let it grow with him rather than replacing it every few weeks. The front-clip D-ring is the key feature for a puller: it redirects him toward you when he surges forward rather than just applying pressure on his back, which is exactly the mechanic you need for loose-lead training at this age. The chest plate is wide and well-padded, which matters for a deep-chested giant breed — narrow straps dig in and cause dogs to fight the harness rather than accept it. Get the Large; it'll fit him now and carry him well into the next growth phase. It won't last to adulthood — nothing in this price range will — but it should give you four to six months before he outgrows it, which is a much better return than what you've been getting.

It's genuinely effective when used correctly — and the Rabbitgoo's front ring is solid metal, not the flimsy plastic loop you get on the really cheap versions, so it holds under repeated redirects. The honest caveat is that a front clip isn't a magic fix on its own: you still need to stop, change direction, and reward the moment the lead goes slack. But it does give you mechanical leverage that a back-clip harness simply doesn't. With a four-month-old Great Dane who's already pulling hard, that leverage is meaningful — it makes the training feedback clearer and faster for him. Most owners using this harness consistently see real improvement in loose-lead behaviour within two to three weeks.

Good luck with him — four months is actually a great time to get this sorted before the teenage phase kicks in around six to nine months, which is when Great Danes really test you. Consistent short sessions with the front clip and plenty of reward for a loose lead and you'll be in a much better place by then.