Carrying water on walks is one of those small habits that separates comfortable dogs from dogs who drink from whatever they find.
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Why not let them drink from puddles and streams
Leptospirosis. A bacterial infection spread through the urine of rats and other wildlife, surviving in standing water and mud. It causes kidney and liver failure and can be fatal. It is also transmissible to humans. Vaccination is available and widely recommended — ask your vet about local risk.
Giardia. A protozoal parasite causing chronic soft, foul-smelling diarrhoea. Extremely common in dogs who drink from streams and puddles, and it is not treated by routine wormers.
Blue-green algae. Blooms in ponds, lakes and slow rivers, particularly in warm weather. Some produce toxins that can kill a dog within hours. If water looks green, scummy, or has a warning sign, keep the dog out entirely — not just out of drinking it, since licking a wet coat is enough.
Agricultural runoff and road runoff. Pesticides, fertilisers, oil, and antifreeze in winter.
Sea water. Causes vomiting and diarrhoea, and in quantity dangerous sodium levels. Always take fresh water to the beach.
What to carry
Bottle-with-bowl designs. A bottle with an attached trough — press a button or tilt to fill, and pour unused water back. The most practical single item, and the best option for a walk.
PupFlask Dog Water Bottle
Stainless steel with an attached bowl and a leak-proof lid. The pour-back feature is what makes these worth having — you can offer a small amount without wasting the rest, which matters when you are rationing a bottle over a long walk.
Collapsible silicone bowls plus any water bottle. Cheapest option, packs flat, clips to a lead or a bag. Two components to remember rather than one.
Fabric fold-flat bowls. Very light, dry slowly, and can leak at the seams over time.
Water-dispensing bottles with a licking valve. Fine for some dogs, and many dislike them.
What to look for
- Leak-proof, tested before it goes in a bag with your phone
- Easy one-handed operation, since the other hand has a lead in it
- Capacity matched to the walk — 350 to 500ml for an hour with a medium dog, considerably more for a long summer hike
- Stainless steel or food-grade plastic. Steel keeps water cooler and does not hold odours
- Easy to clean properly. Biofilm builds in bottles and in the bowl trough
- Attachment — a clip, a strap, or a bottle-cage fit
How much to offer
During a walk: small amounts frequently rather than a lot at once. Every fifteen to twenty minutes in warm weather, or whenever your dog is panting hard.
After hard exercise: small amounts, in stages, over several minutes. A hot dog who gulps a large volume while panting swallows a lot of air, which causes discomfort and, in deep-chested breeds, sits among the factors associated with bloat risk.
Let them cool a little first, then offer a small amount, wait, and offer more.
Daily total, for reference: roughly 50 to 60ml per kilogram of body weight per day for a healthy dog, though this varies considerably with diet, weather and activity.
Signs of dehydration
- Skin tent — lift the skin over the shoulders; it should snap back instantly
- Tacky or dry gums
- Capillary refill — press a gum until pale; colour should return within two seconds
- Sunken eyes
- Lethargy
More than one of these means a vet, not a bowl of water.
Ice
Ice cubes are fine for most dogs and a useful way to increase intake in summer. The claim that ice water causes bloat is not supported by evidence.
The one caution is dogs who crunch ice hard — very hard chewing can fracture teeth, and that is a real risk with any object you cannot dent with a thumbnail.
Winter
Dogs still need water in cold weather, and owners often forget because the dog is not visibly panting.
Also worth knowing: eating snow is not adequate hydration, and it lowers body temperature. Carry water in winter too.
Cleaning
Wash the bottle and bowl properly, not just rinse. Biofilm builds quickly on any surface that holds water, and a bottle that has lived in a rucksack for a fortnight is unpleasant.
Hot soapy water, a bottle brush for the neck, and a full dry before storage.
Keep one in the car permanently
The single most useful thing on this page. A bottle that lives in the boot is a bottle that is there on the day you need it — after an unexpectedly long walk, in a traffic jam in August, or at a service station on the way home.
Alongside it: a towel, poo bags, wipes, and a spare lead. That kit costs very little and removes most of the small crises of dog ownership.
