Water is the most important nutrient, and also the one we measure least. A simple starting point helps you notice when something changes.
A starting number
A common rule of thumb is about 1 fluid ounce per pound a day, which is roughly 60 to 66 ml per kg. For a 50 lb (22.7 kg) dog, that is about 1,360 ml, or around 46 fl oz. This figure is total water, including the water inside food.
What changes it
- Food: dry kibble holds little water, while wet food is mostly water, so dogs on wet food drink less from the bowl.
- Heat: hot weather raises water loss.
- Exercise: active dogs need more.
- Life stage: puppies and nursing mothers need more.
| Diet | Share of water from food (approx.) |
|---|---|
| Dry kibble | about 5% |
| Half dry, half wet | about 40% |
| Fresh or raw | about 65% |
| Wet or canned | about 75% |
When thirst is a warning
Drinking more than about 100 ml per kg a day, which is about 1.5 fl oz per pound, is a reason to call your vet. A sudden change in thirst can point to health problems, so do not wait.
Easy habits
- Keep fresh water out all day and wash the bowl daily.
- Carry water on walks and hot days.
- Use a measuring jug for a few days to learn your dog's normal.
Hot weather and exercise
Dogs cool down mainly by panting, which loses water. On hot days or during long walks, offer water before, during, and after activity, and keep the dog out of strong heat. Never leave a dog in a parked car. If your dog shows heavy panting, drooling, weakness, or collapse, treat it as an emergency and call a vet immediately.
Measuring at home
For a few days, fill the bowl with a measured amount in the morning and measure what is left at night. Do this on ordinary days so you learn your dog's normal. Dogs that share a bowl or drink from other sources make this harder, so use it as a rough guide.
Getting a picky drinker to drink
- Wash the bowl every day and use fresh water.
- Try a wider or different bowl, or a pet fountain.
- Place bowls in more than one room.
- Ask your vet before adding flavorings or broth, since some contain onion or too much salt.
Questions people ask
Where to read more
These numbers are estimates and are not veterinary advice. Talk to your vet before you change your dog's diet, especially if your dog has a health condition. Questions or corrections? Contact me.