What makes black licorice toxic to dogs?

Glycyrrhizin, the natural sweet compound in licorice root. In meaningful amounts it drives blood pressure up and potassium down, which shows as weakness, tremors and lethargy — riskiest for small dogs and dogs with heart or kidney problems.

My dog ate one piece of licorice. Should I panic?

One small piece in a healthy, larger dog is unlikely to cause real harm — watch for vomiting or unusual tiredness. A raided bag, a small dog, or any sugar-free licorice is a call to the vet.

Is red licorice the same problem?

Usually not — most red 'licorice' contains no licorice root, so there's no glycyrrhizin. It's still a sugary candy dogs shouldn't have, and sugar-free versions can contain xylitol, which is an emergency of its own.

Why is salmiakki (salty licorice) worse?

Salty Nordic licorice adds ammonium chloride on top of the glycyrrhizin, so the dog takes a heavy salt load at the same time as the blood-pressure and potassium effects. It's the double-down version of the same problem.

Can Dogs Eat Black Licorice? Vet-Sourced Answer

Can Dogs Eat Black Licorice?

Toxic to dogs

No. Glycyrrhizin in black licorice can push a dog's blood pressure up and drain its potassium — and salty Nordic salmiakki piles a salt load on top.

Quick facts

Quick facts
Verdict	Toxic
Risky amount	No safe or toxic dose is established — treat any amount as a risk.
Key symptoms	Vomiting, Diarrhea, Lethargy or weakness, Muscle tremors or twitching, Increased thirst and urination
What to do	If your dog raided a bag of licorice — especially salty salmiakki, a small dog, or a dog with heart or kidney disease — call your vet; potassium loss, raised blood pressure and salt overload all need checking.

Why black licorice is toxic to dogs

Real black licorice is flavored with licorice root, whose active compound — glycyrrhizin — is the problem. In more than trace amounts it disturbs the body’s salt-and-water balance: blood pressure climbs and potassium drains away, which in a dog looks like lethargy, weakness, vomiting and muscle tremors. Small dogs and dogs with heart or kidney conditions have the least margin.

Nordic-style salty licorice — salmiakki, Dutch drop, lakritz — doubles down by adding ammonium chloride, stacking a serious salt load on top of the glycyrrhizin effects.

Check the label for the bigger emergency

Sugar-free licorice and gummies can be sweetened with xylitol, which is dramatically more dangerous than licorice itself and turns a candy raid into an immediate emergency. Whenever a dog gets into sweets, read the ingredient list before you decide how worried to be.

What to do if your dog ate licorice

One stray piece in a healthy, larger dog: watch for vomiting, unusual tiredness or twitching. A raided bag, salty licorice, a small dog, or anything sugar-free: call your vet with the packaging in hand. Blood-pressure and potassium effects are treatable, but they’re the kind a vet should confirm rather than something to wait out.

If your dog ate it

If your dog raided a bag of licorice — especially salty salmiakki, a small dog, or a dog with heart or kidney disease — call your vet; potassium loss, raised blood pressure and salt overload all need checking.

In the US you can also call the ASPCA Animal Poison Control Center at (888) 426-4435 (a consultation fee may apply).

Frequently asked questions

What makes black licorice toxic to dogs?: Glycyrrhizin, the natural sweet compound in licorice root. In meaningful amounts it drives blood pressure up and potassium down, which shows as weakness, tremors and lethargy — riskiest for small dogs and dogs with heart or kidney problems.
My dog ate one piece of licorice. Should I panic?: One small piece in a healthy, larger dog is unlikely to cause real harm — watch for vomiting or unusual tiredness. A raided bag, a small dog, or any sugar-free licorice is a call to the vet.
Is red licorice the same problem?: Usually not — most red 'licorice' contains no licorice root, so there's no glycyrrhizin. It's still a sugary candy dogs shouldn't have, and sugar-free versions can contain xylitol, which is an emergency of its own.
Why is salmiakki (salty licorice) worse?: Salty Nordic licorice adds ammonium chloride on top of the glycyrrhizin, so the dog takes a heavy salt load at the same time as the blood-pressure and potassium effects. It's the double-down version of the same problem.