Harness sizing for a 7-month Maltipoo

Small dog harnesses have some tricky fitting challenges — most run too loose around the chest or are too rigid for small, soft builds, and the right harness for a Chihuahua is genuinely very different from one for a Dachshund. Being in that awkward between-sizes stage at 7 months makes it even trickier, because puppy sizes are often too snug across the shoulders while standard small sizes gap at the chest. To point you in the right direction: what does your Maltipoo weigh right now, what are you mainly using the harness for — daily walks, car travel, training — and have you tried any harnesses before that slipped or rubbed?

That slipping-forward issue is really common at this age — the chest is still filling out and the shoulder-to-chest ratio hasn't settled yet. At 4.5kg she's right on the edge, but a well-designed adjustable harness will serve her much better than sizing up into a standard small. Can I ask — does she pull at all on the lead, or is she generally calm and loose-lead walking?

Perfect — that's exactly the detail I needed. For a 4.5kg Maltipoo who's still growing, pulls gently, and has had slipping issues, I'd go with the Ruffwear Front Range Harness in the XXS/XS size. It has four points of adjustment — chest, belly, and both sides of the neck — which means you can dial it in precisely at her current size and then loosen it as she fills out over the next few months. The padded chest panel sits flat against small builds without riding forward, which directly fixes the problem you had with her last harness. The front clip attachment subtly redirects her when she pulls without any pressure on the throat. It's not cheap, but it's the one harness I'd confidently say will fit her properly now and still work at 6kg.

The XXS/XS fits a girth of roughly 33–43cm. Maltipoos at 4.5kg typically measure around 36–40cm around the chest, so she should sit comfortably in the lower-middle of that range right now — snug enough to be secure, with room to grow. Before you order, take a soft tape measure and run it around the widest part of her chest, just behind the front legs. If she's 36cm or above, you're in good shape. If she's under 35cm, she's still genuinely puppy-sized and I'd wait another six weeks before buying.

38cm is a great fit — right in the sweet spot. Go for the Ruffwear Front Range XXS/XS with confidence. Clip the lead to the front ring for walks while she's still learning loose-lead walking, and switch to the back ring once she's more consistent. The padded straps mean even daily walks won't cause rubbing, and you won't need to replace it until she's well past the growing stage. It's on Amazon UK and usually arrives quickly — look for the Bluebell Purple or Twilight Grey colourways which tend to be in stock for her size.