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Walnuts are toxic to dogs, and this is one of those cases where the danger is very real.
If you’ve ever been snacking on a handful of walnuts and felt a pair of puppy eyes staring at you, you’re not alone.
But before you toss one over, you need to know that walnuts aren’t a safe treat for your dog.
In this post, we’ll look at how toxic walnuts are to dogs, why they cause problems, and what to do if your dog eats one.
Let’s get into it.
Why Walnuts Are Toxic to Dogs
Walnuts are toxic to dogs for several reasons, and the risks go beyond just a bit of stomach upset.
1. Molds and Tremorgenic Mycotoxins
The biggest danger with walnuts is mold.
Walnuts can easily grow mold during storage, especially if they’ve been sitting around in a damp spot.
This mold produces tremorgenic mycotoxins, which are toxins that attack your dog’s nervous system.
When a dog eats a moldy walnut, it can lead to tremors, seizures, and even death if it’s not treated quickly.
This is why walnuts are toxic to dogs in a way that’s far more serious than many other foods.
2. High Fat Content
Even without mold, walnuts are packed with fat.
A single walnut can deliver a big dose of fat to a small dog, and that’s a problem.
Too much fat in a dog’s diet can trigger pancreatitis, a painful and potentially life-threatening inflammation of the pancreas.
Symptoms include vomiting, diarrhea, abdominal pain, and lethargy.
So while the fat itself isn’t toxic, it contributes to why walnuts are toxic to dogs in large amounts or for sensitive pups.
3. Choking and Blockage Risk
Whole walnuts, especially in the shell, are a choking hazard.
If your dog swallows one without chewing, it can get lodged in the throat or cause an intestinal blockage.
A blockage is a medical emergency that often requires surgery.
So even if the walnut isn’t moldy, the physical shape and size can still make walnuts toxic to dogs by creating an obstruction.
How Toxic Are Walnuts to Dogs?
How toxic walnuts are to dogs depends on a few factors, including the size of your dog and whether the walnut was moldy.
1. Small Dogs Are at Higher Risk
A small dog like a Chihuahua or a Yorkie can be seriously affected by just one or two walnuts.
Their bodies can’t handle the fat load or the toxins as well as a larger dog can.
So for small breeds, walnuts are toxic to dogs at much lower amounts.
2. Moldy Walnuts Are the Worst Case
If your dog eats a walnut that’s been on the ground for a while, the risk skyrockets.
Moldy walnuts are the most dangerous because of those tremorgenic mycotoxins.
Signs of poisoning can show up within 30 minutes to a few hours.
Watch for vomiting, drooling, wobbling, tremors, or seizures.
If you see any of these, get to the vet immediately.
3. Black Walnuts Are Especially Dangerous
Black walnuts, which are common in many backyards, are particularly problematic.
They’re more likely to grow mold, and they also contain juglone, a compound that can be irritating.
So when people ask how toxic walnuts are to dogs, black walnuts are at the top of the list.
What to Do If Your Dog Eats a Walnut
If your dog eats a walnut, don’t panic, but do act fast.
1. Remove Any Remaining Walnuts
First, take away any other walnuts your dog might have access to.
Check the yard, the couch, and anywhere else your dog might have stashed a snack.
2. Call Your Vet or Pet Poison Control
Call your vet or a pet poison hotline right away.
Tell them how many walnuts your dog ate, whether they were moldy, and how long ago it happened.
They’ll tell you whether you need to bring your dog in or if you can monitor at home.
3. Watch for Symptoms
Keep a close eye on your dog for the next several hours.
Look for vomiting, diarrhea, tremors, weakness, or anything that seems off.
If symptoms appear, it’s a vet visit for sure.
So, How Toxic Are Walnuts to Dogs?
Walnuts are toxic to dogs, plain and simple.
The mold, the fat, and the choking risk all add up to a snack that’s just not worth it.
If your dog eats a walnut, call your vet and keep a close watch for symptoms.
When it comes to walnuts and dogs, the safest choice is to keep them out of reach and stick to dog-safe treats instead.