Summer in the UK can be unpredictable, but when temperatures climb, my Bullmastiffs — like many of yours — are at real risk of heatstroke. Over the years at Shadowguard Bullmastiffs, I’ve had to act quickly more than once. What follows is a practical, experience-based emergency action plan you can use the moment you suspect your dog is overheating. It’s written in the first person because these are techniques I’ve used, tested and refined through hands-on rescue and everyday care.

Recognising heatstroke in Bullmastiffs

Bullmastiffs are heavy, short-muzzled dogs with dense bodies — characteristics that make them more susceptible to overheating. Early recognition is crucial. Watch for:

  • Very rapid panting or noisy breathing
  • Bright red or very pale gums and tongue
  • Drooling, thick saliva
  • Extreme lethargy, wobbliness or collapsing
  • Vomiting or diarrhoea
  • Excessive drooling and glazed eyes

    • If you see any of these signs, treat them as an emergency and act immediately. Time counts.

    Immediate safety steps (first 1–5 minutes)

    Do not overthink — start with these basics immediately while organising transport to your vet or emergency clinic.

  • Move your dog out of direct sun into shade or an air-conditioned/car environment.
  • Call your vet and tell them you’re on the way with a suspected heatstroke; they may give instructions over the phone.
  • Get water into your dog — but don’t force gulping. Offer small sips if conscious and able to drink.
  • Start cooling using the methods below; keep monitoring breathing and consciousness.

    • Immediate cooling techniques I use and trust

    Cooling needs to be controlled. Rapid cooling with ice or cold water can cause vasoconstriction and worsen internal temperature regulation. Here are safe, effective techniques I use at home and in rescues.

  • Cool (not ice-cold) water onto the body: Use tepid water (around 15–20°C). Wet the dog's groin, armpits, and belly — areas with large blood vessels close to the skin. I use a watering can or gentle hose setting, avoiding a high-pressure spray.
  • Wet towels method: Lay cool, damp towels over the neck, chest and inner thighs. Replace towels frequently as they warm up. This is my go-to when a hose isn’t available.
  • Fan plus wetting: Combine wetting with a fan to increase evaporation. In my garage or clinic set-ups I use a portable fan (a simple battery or mains fan works). The evaporation effect cools faster than water alone.
  • Cool packs on large vessels: If you have gel packs or frozen peas wrapped in a towel, place them gently on the neck and groin. Never apply directly to skin — use a barrier towel.
  • Encouraging drinking cautiously: Offer small amounts of cool water or an electrolyte solution like dog-safe Pedialyte (unflavoured) if your dog is conscious. Avoid forcing large gulps that could lead to aspiration.

    • Throughout this process, keep checking the gum colour, breathing, and responsiveness. If your dog becomes unresponsive, stop cooling and focus on airway and breathing while en route to the vet.

    Safe DIY cooling setups for travel and home

    I always keep simple, portable kit items ready for hot days or long trips:

  • Foldable water bowl and a spray bottle filled with clean water.
  • A lightweight towel or microfibre towel for quick wetting.
  • A small battery fan or USB fan for the car.
  • An insulated cooler with sealed gel packs (kept frozen) wrapped in towels.
  • A travel shade or umbrella for sudden roadside stops.

    • For car travel: park away from the sun, run the engine with air conditioning if it’s safe, and never leave your dog unattended inside a vehicle even for a few minutes. On extremely hot days I avoid long trips whenever possible.

    Temperature target and monitoring

    A rectal thermometer is the most reliable way to know core temperature. If you have one and are comfortable using it, aim to reduce the dog’s temperature to about 39–39.5°C (102.2–103.1°F). Do not attempt to cool below 39°C — over-cooling can be dangerous. If you don’t have a thermometer, cool until heavy panting eases and gum colour returns to normal, then stop and proceed to the vet.

    What to avoid before you reach the vet

    Some well-meaning actions do more harm than good. From my experience, avoid the following:

  • Do not use ice baths: Rapid immersion in ice water can cause shock and constrict blood vessels, preventing heat from leaving the core.
  • Do not force large amounts of water: Forcing can cause inhalation and complicate respiratory distress.
  • Avoid stimulants: Don’t give aspirin, anti-inflammatories or human medicines unless explicitly directed by your vet.
  • Do not leave a collapsed dog alone: Keep them monitored and calm; movement can exacerbate organ damage.
  • Don’t wait to see if symptoms improve completely at home: Heatstroke can cause delayed organ damage. Even if the dog seems better, a veterinary exam and bloodwork are essential.

    • What the vet will do and why quick transport matters

    At the clinic, veterinarians will check temperature, blood pressure, bloodwork and organ function. They may provide IV fluids, oxygen, medications to control seizures or blood clotting issues, and continued temperature control. Heatstroke can cause delayed complications — clotting disorders, kidney injury, and muscle breakdown — so the sooner professional care begins, the better the outcome.

    Aftercare I recommend based on rescue cases

    After discharge, I advise close monitoring at home and a follow-up within 24–72 hours. Key post-heatstroke care steps I use:

  • Rest in a cool, quiet room for several days.
  • Encourage small, frequent water intake; monitor urine colour.
  • Observe for vomiting, diarrhoea, disorientation or weakness and report immediately if they recur.
  • Limit exercise for at least one week and only reintroduce activity gradually after vet clearance.

    • Prevention — because heatstroke is largely avoidable

    Prevention is the best medicine. From my breeding and rescue work, I always emphasise:

  • Never leave Bullmastiffs in parked cars, even with windows cracked.
  • Provide shaded areas and plenty of fresh water outdoors.
  • Schedule walks for cooler parts of the day (early morning, evening).
  • Use cooling mats, shaded paddocks and plenty of airflow when dogs are outside.
  • Understand individual risk: older dogs, overweight dogs, short-muzzled dogs and dogs with medical conditions are especially vulnerable.

    • If you carry some of the simple items I mentioned — spray bottle, towel, fan and a route to your nearest emergency clinic — you’ll be far better prepared. Heatstroke is scary, but with calm, prompt action you significantly improve your dog’s chances. If you’re unsure or worried at any point, call your vet and get to an emergency clinic quickly — I always err on the side of speed when dealing with Bullmastiffs and heat.