Sand Impaction in Dogs: The Beach Hazard Hiding in Plain Sand

What every Kiwi dog owner should know about sand impaction, gut health, and why tennis balls need to go

We are so lucky here in New Zealand. Beautiful beaches everywhere, and so many of us walk our dogs on them regularly, some even daily. It's one of the best parts of dog ownership in this country.

But there's something most of us have never thought twice about, and it's hiding in plain sight (or should I say, plain sand). That soft, golden stuff your dog is bounding through, digging in, and chasing balls across? It can cause some genuinely serious problems if your dog is swallowing more of it than you realise.

Let's dig into it (sorry, had to).

An x-ray showing sand impaction in a dog's intestine. This is what we're trying to avoid with a bit of awareness on our beach walks.

How Dogs Actually Ingest Sand at the Beach

It's rarely a dog deciding "I'm going to eat some sand today." It happens without them even noticing:

• Playing fetch with a ball or stick. Every time they pick it up off the beach, a bit of sand comes with it.

• Windy days. Dogs are low to the ground, and on a blustery day sand gets blown straight into their mouth and nose while they're sniffing around or panting.

• Digging. Some dogs love a good dig, and inevitably some of what they dig up gets swallowed too.

• Drinking or playing in the shallows. Wet sand clings to everything, including toys and paws that get licked afterwards.

None of this looks dangerous in the moment. That's exactly why it catches people out.

What Is Sand Impaction in Dogs?

Here's the bit that surprises most owners. Unlike a lot of things dogs swallow, sand does not reliably pass through. It can compact together in the gut like wet cement, building up into a blockage in the intestines. Vets call this sand impaction.

Signs usually show up somewhere between 12 and 48 hours after a big beach day, so it's easy to miss the connection at first. Watch for:

• Vomiting

• Loss of appetite

• Lethargy or seeming "off"

• Abdominal pain, restlessness, not wanting to settle

• A hard or tender belly

• Sandy or gritty diarrhoea

If you see these signs after a beach visit, get onto your vet. This is genuinely one of those "don't wait and see" situations. The good news is that most cases are treated without surgery, using IV fluids, anti-nausea medication, and pain relief to help things move through naturally. Surgery is actually avoided where possible, because operating on a gut full of contaminated sand carries a real infection risk. But left untreated, a full blockage can be fatal. Early vet care makes all the difference to the outcome.

Sand Impaction and Gut Health: More Than Just a Blockage

This is the part that really gets my attention, and I think it should get yours too.

There's a documented case series of dogs that came in seriously unwell after a beach day, with vomiting (sometimes with blood), bloody diarrhoea, and lethargy, but with no full blockage at all on imaging. So what was going on?

When vets looked closer with endoscopy and biopsies, they found the sand itself had caused direct mechanical damage to the stomach and gut lining. We're talking ulceration, inflammation, and gritty mineral particles actually embedded in the damaged tissue. These dogs needed 7 to 10 days of supportive care to recover, and there was no obstruction to blame. Just sand, scraping its way through a soft, absorptive lining that was never built to handle it.

Now, I want to be straight with you here rather than overstate it: that particular study didn't set out to measure microbiome changes, so I can't point you to a paper that says "sand causes dysbiosis" in black and white. What I can say, based on what we do know about gut health, is that this kind of mucosal injury and inflammation is exactly the kind of insult that tends to throw the gut microbiome off balance. A damaged gut lining and an inflamed gut are rarely a happy home for a balanced microbial population. So while I can't hand you a study with "sand + microbiome" in the title, the physiology lines up. This is a genuine gut health issue, not just a "will it get stuck" issue.

Why Tennis Balls Make the Problem Worse

While we're on the subject of beach toys, I need to talk about tennis balls, because this one is close to home.

I used to have a border collie called Bailey. Absolute tennis ball addict. We played fetch at the beach with him regularly for years, because I didn't know any better at the time. Over time, I noticed his canine teeth were wearing down. By the end of his life, they'd worn down significantly. When I asked my vet about it, they explained exactly why: the fuzzy felt on a tennis ball isn't as soft as it looks. It grips onto dirt and sand, and every time your dog carries it around in their mouth, it acts like sandpaper on their teeth. Do that for years, and you get real, permanent dental wear. Vets refer to this as "blunting," and in bad cases it can wear teeth down enough to expose the pulp underneath, which is painful and can need dental treatment.

At the beach, this problem gets worse, not better, because the ball is constantly picking up wet sand.

My advice, full stop: skip tennis balls with your dog altogether. They're genuinely rough on teeth, beach or no beach. If you want to play ball, go for a proper rubber dog ball instead. And even then, try to avoid ball games directly on dry sand, since every throw and retrieve is another mouthful of grit.

How to Prevent Sand Impaction at the Beach

You don't need to stop beach trips, you just need to play a bit smarter.

• Throw a stick or toy into the water instead of onto the sand. It's not perfect (there's still some sand in the water and on the toy), but it's a big improvement on dry sand fetch.

• Rinse toys off before and after play, so you're not handing your dog a sand-crusted toy to chew on.

• Use rubber toys, not tennis balls, for any beach fetch.

• Discourage digging where you can, especially repetitive digging in the same spot.

• Watch wind conditions. On a really blustery day, it might be more of a sniff-and-wander walk than a big fetch session.

• Bring fresh water, so your dog isn't tempted to drink from the shallows or lick sandy paws out of thirst.

Supporting Your Dog's Gut After a Beach Day

If your dog's had a big, sandy, boisterous beach session, it's not a bad idea to give their gut a bit of extra love that evening, especially if they're a dog who tends to get a sensitive tummy.

Something gut-soothing like our Beef Bone Broth is an easy, gentle way to support hydration and settle things down. If you know your dog has ingested a fair bit of sand or has a history of gut sensitivity, a gut-support supplement like Gut Restore can help support the gut lining, alongside a good probiotic to help keep the microbial balance on side, like our new Proactive Paws Primitive Probiotics. It's formulated specifically for the canine gut (not adapted from a human formula), with a blend of ancestral, species-specific and soil-based strains, so it's a solid everyday option or a nice one to lean on after a rough gut day. Our MicroMed Oral Probiotic is another good everyday option too.

That said, none of this replaces a vet visit if your dog is showing actual symptoms like vomiting, lethargy, or a painful belly. Supplements support a healthy gut, they don't treat a blockage.

The Quick Version on Sand Impaction in Dogs

• Sand can build up in the gut and cause a genuine blockage (sand impaction), which can be fatal if left untreated.

• Even without a full blockage, sand can physically damage and inflame the gut lining, which is a real gut health concern, not just a "might get stuck" concern.

• Watch for vomiting, lethargy, appetite loss, belly pain, or gritty diarrhoea in the 12 to 48 hours after a beach visit, and get to your vet if you see them.

• Ditch the tennis balls. The fuzz plus sand is genuinely like sandpaper on your dog's teeth.

• Throw in the water, not on dry sand, rinse toys, and use rubber toys instead of tennis balls.

• A bit of gut support after a big sandy day doesn't hurt, but it's not a substitute for vet care if something's actually wrong.

We're lucky to have these beaches. Let's just be a bit more switched on about what's going into our dogs' mouths while we enjoy them.

Written by Kat, canine nutritionist at The Healthy Hound, NZ specialists in raw feeding and gut-first canine health.