25/06/2026
Water Intoxication in Dogs
With the heat we’re experiencing at the moment, lots of people will be using water play as a way to help their dog keep cool. This is a great idea, and can be a massive help in this hot weather, but everyone should be aware of the risk of water intoxication as well.
What is water intoxication?
It occurs when a dog swallows too much water while playing. This can dilute the sodium concentration in the blood and lead to hyponatremia – very low levels of sodium in the blood. This can result in swelling of the body’s cells; if this happens in the brain cells, it can cause brain damage.
Water intoxication is RARE, but symptoms can develop quickly and it can be very serious. In severe cases, it can be fatal.
Symptoms of water intoxication include:
- Nausea
- Lethargy
- Weakness
- Loss of coordination/staggering
- Bloating
- Vomiting
- Excessive salivation
- Dilated pupils
- Glazed eyes
And in more severe cases:
- Difficulty breathing
- Collapse
- Seizure
If your dog starts showing any of the above signs after swimming or playing in water, contact your vet for advice immediately.
This doesn’t mean you need to avoid water play with your dog. They are not automatically at risk just from being in contact with water. Dogs are more at risk if they repeatedly swallow water during high-energy play, such as:
- Swimming for long periods without breaks
- Chasing balls into water repetitively
- Diving for toys
- Biting at hoses/sprinklers/push-button water toys
- Snapping at waves or chomping at water while swimming
Some dogs are also more at risk than others. These include:
- Smaller dogs (as they don’t need to swallow as much water to be affected).
- High-energy dogs who are more likely to engage in the activities listed above for longer periods.
- Dogs with little fat (fat can help to absorb excess fluid – no, this doesn’t mean you should overfeed your dog ‘to reduce the risk’!)
Vets recommend ensuring your dog takes a break every 10-15 minutes to prevent water intoxication. Small dogs may need more frequent breaks than this. You should also stop sooner if your dog is gulping, coughing, tired, or keeps returning with a mouth full of water. If your dog’s playstyle is frantic, they may also need more frequent breaks, even if they want to continue indefinitely.
Water is a fantastic tool to help keep dogs cool in hot weather, so don’t stop using it, just make sure to limit playtime in the water to avoid overconsumption of it. Be sensible. Watch your dog carefully and make sure you know what signs to look out for.