Cooling vest for Leonberger first hot season

Heatstroke in dogs is a genuine risk in hot weather — and for a heavy-coated giant breed like a Leonberger, that risk arrives fast and hard. Cooling vests work through evaporative cooling: you soak them in cold water, wring them out, and the slow evaporation draws heat away from the body. They work best in lower humidity, and they need re-wetting as they dry out. To point you to the right vest, it'd help to know: what's your Leonberger's rough weight right now, what kind of heat are you dealing with (garden walks, hiking, humid summers?), and how active is he or she in warm weather?

Good instinct shifting walks earlier — that alone will make a real difference for a dog her size. At 45kg with a thick double coat, she'll build heat quickly even at 25°C, so having a vest as a backup for warmer days or car journeys is genuinely sensible. For a Leonberger, the fit matters a lot — you need something that covers the core well and doesn't compress her chest or restrict movement. What's her rough chest girth? That'll confirm sizing, but at 45kg she'll almost certainly be in an XL.

That puts her comfortably in the XL of the Ruffwear Swamp Cooler, which is what I'd recommend for her. It's a proper evaporative cooling vest — not a soaking-wet soak-the-fur type, but a structured vest with three layers: an outer UV-reflective shell, an evaporative middle layer, and an inner wicking layer that sits against the coat. For a dog her size and coat type, that layered approach is more effective than a simple wet cloth style. It covers the core and flanks where it counts, has a harness attachment point on top so you can clip a lead directly to it, and it holds water well enough for a couple of hours between re-wettings. It's widely stocked in the UK and sized specifically for large breeds — the XL fits chest girths up to around 89cm, so she should have room. I'd wet it thoroughly before you head out, and carry a small bottle of water to refresh it if you're out longer than an hour in real heat.

Yes — don't leave it until the first hot day. Put it on her dry a few times indoors first so she gets used to the feel and fit, then try it wet on a cooler day before you need it in earnest. Leonbergers are generally calm about wearing gear but the sensation of a wet vest can surprise any dog the first time. Also check the fit once it's wet — it should lie snug against her sides without bunching, and you should be able to slide two fingers under the chest strap comfortably. And always combine it with access to shade and water; the vest helps but it's one layer of a plan, not the whole plan.

Good call — you're well ahead of most owners by sorting this in spring. She'll be much more comfortable for it, and you'll have peace of mind on the warmer days. Enjoy those early morning walks.