Best Harness for Shih Tzu with Eye Pressure Issues

A vet recommendation to move away from collar pressure for a Shih Tzu with eye concerns is really important — brachycephalic breeds like Shih Tzus are already prone to elevated intraocular pressure, and any tugging or strain at the neck can make that worse. Small dog harnesses have their own fitting challenges though: most are either too loose around the chest or built with rigid frames that don't suit a Shih Tzu's compact, barrel-shaped body. The right fit here matters for comfort and for actually keeping pressure off the neck and head. Can you tell me roughly how much your dog weighs, and have you tried any harnesses before — did anything slip, rub, or feel awkward on them?

That's actually a helpful starting point — you're not undoing any bad habits, just finding the right thing first time. At 5.5kg she'll sit in the small or medium range depending on her chest girth, which for Shih Tzus is usually broader than people expect relative to their length. The priority here is a step-in or vest-style harness that distributes any lead pressure entirely across the chest and shoulders, with nothing that loops near the throat. Does she pull at all on the lead, or is this more about gentle daily walks and the occasional tug when she spots something?

Perfect — for a calm dog with a clear medical reason to avoid any neck strain, the Puppia Soft Harness in size Small is what I'd go with. It's a vest-style step-in design made from soft mesh, so there's no rigid frame pressing into her chest and nothing that sits near the throat at all. The lead clips to a D-ring on the back, well away from the head. It's machine washable, very lightweight, and Shih Tzu owners use it specifically because the broad chest panel sits flat without bunching. At 5.5kg she'll likely need the Small — measure her chest girth just behind the front legs before ordering, as Puppia's sizing is reliable when you go by that measurement rather than weight alone. It's widely available on Amazon UK and usually under £15.

Yes — the two-finger rule is your main check: once it's on and clipped, you should be able to slide two fingers comfortably under any strap, but no more than that. With the Puppia specifically, check that the chest panel sits flat across her sternum and isn't riding up toward her armpits, which can cause chafing on short-legged dogs. The neck opening should have clear space all the way around — if it's touching her neck at rest, size up. Give her a few minutes wearing it indoors before the first walk so she can move naturally and you can spot any rubbing before it becomes a sore spot.

Great — you're doing the right thing taking the vet's advice seriously on this. The Puppia Soft Harness Small should be a comfortable fit for her, and because she's not a puller, it'll do exactly what you need without any extra engineering. If after a few walks it seems to shift or the chest panel gaps, just come back and we can look at alternatives with a slightly different cut.