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Saltwater poisoning in dogs

The seaside can be great fun for you and your dog, whether you’re going for a bracing winter walk or having a relaxing day in the shade. Spending a day at the beach with your dog is a great way to introduce them to a fun and enriching environment, but beach trips also come with unique dangers for dogs.

Drinking sea water can be really dangerous for dogs and can result in harmful side effects, such as diarrhoea and vomiting, and in extreme cases it can cause seizures and even death. Generally speaking, a few sips of seawater won’t do your dog any harm, but if they drink a significant amount, you might need to act right away. Let’s take a look at the signs of saltwater poisoning and what to do if your dog drinks sea water.

Why is it dangerous for dogs to drink sea water?

It’s no surprise that dogs and seawater don’t mix. There are high levels of salt in seawater, and your dog can quickly become dehydrated if they drink too much. It’s really common for dogs to sip on seawater when they’re at the beach; they’ll often have done lots of exercise in an exciting environment, or visited on a hot day, so they’ll be on the lookout for water to quench their thirst.

For dogs, seawater looks like a refreshing source of water, but this isn’t the case and if they drink too much, they can quickly become dehydrated. It’s important to always bring plenty of fresh drinking water with you every time you visit the beach with your dog.

When a dog ingests excessive amounts of salts, their body will try and correct the imbalance. Cells in their body will release water to even out the high salt levels in their blood, which can result in your dog becoming dizzy, lethargic and confused.

When the levels of salt in the blood get too high, their muscles stiffen up as they lose moisture, which can result in shaking or tremors.

What are the symptoms of saltwater poisoning in dogs?

Dogs love the beach because it offers a large, open space where they can run, play and paddle. It can be hard to keep a watchful eye on your pooch when you’re by the sea, even if you are vigilant, it can be hard to tell if they’ve been drinking sea water.

Some of the most notable signs include extreme thirst, excessive urination, and confused behaviour. The common symptoms of salt poisoning include:

  • Excessive urination
  • Extreme thirst
  • Confusion
  • Lethargy
  • Diarrhoea
  • Vomiting
  • Nausea
  • Odd behaviour
  • Muscle spasms
  • Seizures
  • Death (in extreme cases)

If you have been at the beach and your dog seems to be behaving differently, such as looking confused or walking strangely, it could be a sign that they have ingested too much sea water.

What to do if your dog drinks sea water

If you’re planning a trip to the beach with your dog, there are a few essentials to bring along to make sure that your dog is comfortable and catered for. It’s always a good idea to bring an umbrella so that your dog has somewhere shady to cool off, poo bags, treats, and plenty of fresh drinking water.

By making sure that they have lots of clean, fresh water to drink, you’ll lower the chances of them trying to drink sea water in the first place. If your dog has been drinking sea water, they might experience vomiting and diarrhoea. Offering your dog sips of fresh water every 30 minutes or so will help to rehydrate them and will replenish their bodily fluids.

Most dogs will recover after drinking sea water, but you’ll need to monitor your dog to make sure that nothing changes. If your dog continues to show symptoms of saltwater poisoning or you have any concerns about their wellbeing, speak to your vet.

Need more info?

For more information on saltwater poisoning, keeping safe on doggy days out, or any other aspect of your dog’s health and wellbeing, contact us to speak to our team of experts.

Ellen Whale

Ellen Whale

Patient Care Assistant/ Receptionist
PCA

Ellen joined us in 2026 after previously working in another vet practice and an animal sanctuary.

She loves horses and has two of her own called Molly and Abbie.  she also has four dogs who she enjoys walking in the Norfolk countryside. 

Adri Rossouw

Adri Rossouw

Locum Veterinary Surgeon
BVSc CertAVP (FelMed) MRCVS

Adri qualified as a Vet Surgeon in South Africa in May 1992 before moving to the UK in 1998.  She was partner in a small animal vet practice in Norfolk before retiring in May 2023.  She missed working with animals so now works as a locum part time.  She brings a wealth of experience to the team.  She achieved a CertAVP Small Animal Medicine (feline medicine) certificate in 2023.  She also enjoys orthopaedic and soft tissue surgery. 

Outside work Adri enjoys gardening, cycling and walking as well as being involved in the Gateway Church in Kings Lynn.  Adri has a tuxedo cat called Karolus and the village peacock Bob has claimed her garden.

Helen Manson

Veterinary Surgeon
BVM&S CertVOphthal MRCVS

Helen moved to Norfolk after graduating from Edinburgh Vet School in 2003. After working in practices around King’s Lynn, she joined the practice in 2023.


Helen enjoys small animal medicine and has a special interest in Ophthalmology. Helen gained her post graduate RCVS certificate in Veterinary Ophthalmology in 2012 and offers internal and external referrals for eye cases at the practice.


Outside of work, Helen is kept busy with her three children, Daisy the Labrador and Maggie the cat. She is married to Liam.

Ben Mcdonnell

Clinical Director & Veterinary Surgeon
BVSc, BSc, Cert AVP (GSAS)MRCVS

Following his graduation from Liverpool University in 2008 Ben returned to his roots in Cumbria, where he spent a short period working in mixed practice, before making the decision to work solely as a small animal veterinarian. He moved to Norfolk in 2022, when he joined our team at Swaffham, becoming a clinical director in 2025. Ben enjoys all aspects of first opinion small practice work, but especially enjoys the surgical side of the job and achieved the Royal College Certificate in Advanced Veterinary Practice (General Small Animal Surgery) in 2021.


Outside work Ben is often found exploring the Norfolk countryside and coastline with his son Joey. His other interests include mountain biking, walking, running and more recently paddle boarding.

Emily Neep

Veterinary Surgeon
BVetMed BSc(hons) MRCVS

Emily joined Swaffham Veterinary Centre in 2023, having worked as a vet in Wales. Originally from Norfolk, she was very excited to move back home! She has a keen interest in exotic animal care and also is trained in acupuncture.


In her spare time, Emily enjoys exploring her creative side with various craft projects, from crochet to jewellery making and can often be heard singing along to her favourite musical (much to the nurse’s dismay!). She has always had pets at home, ranging from various cats and dogs to a pet toad!

Liam Manson

Clinical Director & Veterinary Surgeon
BVM&S GPCert (SAS) MRCVS

Liam founded Swaffham veterinary Centre in 2014, having worked in mid-Norfolk since graduating from Edinburgh University in 2003.  He completed a surgical certificate in 2007 and continues to have a keen interest in surgery but does enjoy the variety that a busy first opinion small animal practice gives each day.

Out of work Liam enjoys spending time with his wife and children, who all enjoy travelling in the UK and abroad.  he also enjoys exploring the beautiful Norfolk countryside with his Labrador Daisy.  When given the opportunity Liam is a keen gardener.