A hot weather hydration plan for dogs: how much water, where to put it and when to worry

A common baseline for healthy adult dogs is roughly 50 ml per kg of body weight per day, including water from food. In hot weather, or after exercise, that can double. Dogs on wet food get a lot of water from their meals and drink less from the bowl, so do not panic if a wet-fed dog seems to drink little.

Measure for a few days in normal weather to learn what your dog usually drinks. Pour a known amount into the bowl in the morning, measure what remains the next morning, and account for spills. That baseline makes it much easier to spot a change later.

Put out more water than you think your dog needs, in more than one place. A bowl in the kitchen, one near where your dog naps and one in the garden in full shade means a hot dog never has to go far. Choose a bowl big enough for the day's needs with room to spare, and heavy enough that it cannot be tipped by a paw.

Material matters in the heat. Stainless steel left in the sun can become hot to the touch, and plastic warms quickly too. Ceramic stays cooler, and any bowl stays cooler in shade. Refresh water at least twice a day in hot weather, because warm, stale water grows biofilm faster and many dogs drink less of it.

Food is an easy way to top up. Adding 100 to 200 ml of water to a medium dog's kibble at each meal, or switching part of the diet to wet food, raises daily intake without relying on the dog to drink. Frozen lick mats with wet food, or ice cubes made from water with a little plain broth that has no onion or garlic, give dogs a cooling activity on hot afternoons.

A shallow paddling pool in shade can help dogs who like water, as long as it is emptied and refilled daily and your dog is supervised. Never force a dog into water it does not enjoy.

Move walks to the coolest parts of the day, usually before 8:00 and after 20:00 in summer. On hot afternoons, a short toilet break is enough. Test the pavement with the back of your hand for seven seconds: if it is too hot for you to hold, it is too hot for paws.

On any walk longer than about 20 minutes in warm weather, carry water and a collapsible bowl. As a rough guide, bring about 500 ml per 10 kg of dog for an hour out, and offer small drinks every 15 to 20 minutes rather than waiting until your dog is desperate. After hard exercise, let your dog drink small amounts every few minutes instead of gulping a huge volume at once. Skip fetch, running and cycling alongside the dog on hot days.

Flat-faced breeds such as Pugs, French Bulldogs and English Bulldogs cannot pant as efficiently, so they overheat faster. Heavy-coated breeds such as Huskies and Bernese Mountain Dogs, dogs carrying extra weight, seniors, young puppies and dogs with heart or breathing problems also struggle in heat.

For these dogs, keep walks very short and early, provide a cool indoor room during the hottest hours, and do not rely on them to drink when they need to. Offer water often, add it to food, and keep them calm. Never shave a double-coated dog to cool it down without asking your vet or groomer first, since the coat can help insulate against heat.

Never leave a dog in a parked car on a warm day, even with windows open or for a few minutes. The temperature inside a car can rise by around 10°C (18°F) in 10 minutes, even when it does not feel very hot outside.

For car trips, travel during cooler hours, use shade screens on windows, keep air conditioning running and stop every hour or so for water in a shady place. Bring more water than you think you need, for example two liters for a medium dog on a half-day trip.

Watch your dog closely on hot days. Mild thirst is normal; the signs below are not. Heat stress can become life-threatening quickly, so treat any of these as urgent.

If you notice these signs, stop activity, move your dog into shade or a cool room and phone your vet or the nearest emergency clinic at once. They will tell you how to start cooling your dog safely on the way. Do not wait to see whether your dog recovers on its own.