Salt poisoning in dogs and cats
Toxic agent: Sodium chloride · Reviewed 2026-08-18
Phone a vet now, before reading on. Have ready: your pet's weight, roughly how much was eaten and when, and the packaging if there is any. ASPCA Animal Poison Control (+1 888 426 4435), Pet Poison Helpline, or Animal PoisonLine in the UK.
Salt poisoning is rarely about food. It is about seawater, homemade play dough, de-icer on paws and dishwasher tablets — and correcting it too quickly is as dangerous as the poisoning.
What it actually does
Excess sodium pulls water out of cells, including brain cells, which shrink. The brain adapts by generating internal osmolytes to hold water in. That adaptation is why treatment must be slow: if blood sodium is corrected rapidly, water floods back into brain cells and causes cerebral oedema. So the poisoning and its treatment both threaten the brain.
How much matters
Where the dangerous doses actually come from:
| From about 2–3 g/kg | potentially lethal |
|---|---|
| Seawater | the commonest cause in dogs — drinking it while playing at the beach |
| Homemade salt dough ornaments | extremely high salt, and shaped like biscuits |
| Rock salt and de-icer | licked off paws in winter |
| Dishwasher salt and tablets | also caustic |
| Table salt used to induce vomiting | a discredited practice that causes poisoning |
If someone has advised you to make a dog vomit using salt, do not. It is an outdated method that has caused fatal sodium poisoning, and modern veterinary practice uses safer emetics.
What you will see, and when
Onset: 1 to 3 hours. Typical course: Correction is deliberately slow — 24 to 72 hours.
- 1–3 hoursVomiting, diarrhoea, intense thirst, staggering
- 3–12 hoursTremors, disorientation, weakness, high temperature
- 12+ hoursSeizures, brain swelling, coma
What the vet will do
Blood sodium is measured, and then lowered slowly and deliberately — typically no faster than about 0.5 mmol/L per hour — with carefully chosen intravenous fluids. Free water is offered in small frequent amounts rather than allowing the animal to drink to excess. Neurological status is monitored throughout.
Outlook
Good with controlled correction. The danger is as much from rapid rehydration as from the salt.
Dogs and cats are not the same here
Both. Dogs at the beach are the classic case; cats more often via de-icer or licking a caustic product.
Where it comes from in a normal house
- Seawater and rock pools
- Homemade salt dough decorations
- Winter road salt and paw-melt products
- Dishwasher salt and rinse aid
- Very salty snacks eaten in quantity — crisps, cured meat, stock cubes
The thing people get wrong
“Give them lots of water to flush it out.”
Letting a salt-poisoned animal drink freely is how you cause brain swelling. Small frequent amounts of water and a vet controlling the correction rate is the safe route — this is one where the intuitive first aid is the wrong move.
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Get PawLife on the App StoreFrequently asked questions
How much Salt is dangerous?
If someone has advised you to make a dog vomit using salt, do not. It is an outdated method that has caused fatal sodium poisoning, and modern veterinary practice uses safer emetics.
How long after exposure to Salt do symptoms start?
1 to 3 hours. Vomiting, diarrhoea, intense thirst, staggering. Correction is deliberately slow — 24 to 72 hours.
Is Salt worse for cats or dogs?
Both. Dogs at the beach are the classic case; cats more often via de-icer or licking a caustic product.
Is it true that: Give them lots of water to flush it out.
Letting a salt-poisoned animal drink freely is how you cause brain swelling. Small frequent amounts of water and a vet controlling the correction rate is the safe route — this is one where the intuitive first aid is the wrong move.
Sources
This page is information, not veterinary advice. Toxic doses vary with body weight, age, breed and individual sensitivity, and the figures above exist to explain what a vet is assessing, never to decide that an amount is safe. If you are reading this because something has already been eaten, call a vet.