Pet Safety / Compounds / Xylitol

Is Xylitol safe for dogs and cats?

Extreme risk for pets

EXTREMELY TOXIC to dogs - causes rapid insulin release and potentially fatal liver failure.

What is xylitol?

Xylitol is a sugar alcohol, sweetener, food additive.

The IUPAC name is (2R,3r,4S)-pentane-1,2,3,4,5-pentol.

Also known as: (2R,3r,4S)-pentane-1,2,3,4,5-pentol, birch sugar, wood sugar, E967.

IUPAC name
(2R,3r,4S)-pentane-1,2,3,4,5-pentol
CAS number
87-99-0
Molecular formula
C5H12O5
Molecular weight
152.15 g/mol
SMILES
C(C(C(C(CO)O)O)O)O
PubChem CID
6912

Risk for dogs

Extreme risk

EXTREMELY TOXIC to dogs - causes rapid insulin release and potentially fatal liver failure.

According to ASPCA and veterinary toxicology literature, xylitol causes rapid insulin release in dogs (30-60 minutes post-ingestion), leading to life-threatening hypoglycemia. Higher doses cause acute liver failure. Toxic dose: as low as 0.1g/kg causes hypoglycemia; 0.5g/kg can cause liver failure. A single piece of sugar-free gum can be toxic to small dogs.

Symptoms of exposure

  • Vomiting (within 30 min - 2 hours, per ASPCA)
  • Weakness/lethargy (per ASPCA)
  • Loss of coordination/ataxia (per veterinary literature)
  • Tremors or seizures (with severe hypoglycemia, per ASPCA)
  • Collapse (per ASPCA)
  • Jaundice/yellow gums (liver failure, may appear 12-24 hours later, per veterinary literature)
What to do: EMERGENCY - Call ASPCA Poison Control (888-426-4435) and go to emergency vet IMMEDIATELY. Time-sensitive: best outcomes with treatment within 30 minutes. Do not wait for symptoms.

This is a TRUE VETERINARY EMERGENCY. Even tiny amounts are dangerous. Sugar-free products often contain xylitol - check labels.

Risk for cats

Low risk

Limited toxicity data in cats; appears less sensitive than dogs but caution advised.

According to veterinary literature, cats appear less susceptible to xylitol toxicity than dogs. Few documented cases. However, due to limited data and potential risk, exposure should be avoided.

What to do: Contact veterinarian if ingestion suspected. Monitor for signs of illness.

Regulatory consensus

3 regulatory and scientific bodies have classified Xylitol. The classifications differ — that's the data.

AgencyYearClassificationNotes
FDA2019Generally Recognized as Safe (GRAS) for human consumptionApproved as food additive and sweetener
EPA CTX / Genetox—Genotoxicity: positive (Ames: positive, 4 positive / 7 negative reports)
EPA CTX / Genetox—Genotoxicity: positive (Ames: positive, 4 positive / 7 negative reports)

Regulators apply different standards of evidence — animal-data weighting, exposure-pattern assumptions, epidemiological power thresholds — which is why two scientific bodies can review the same data and reach different conclusions. The disagreement is the data.

Where pets encounter xylitol

  • Sugar Free Gum — Ice Breakers, Trident, Orbit, Mentos Pure Fresh
    Most common source of dog poisoning - a single piece can be toxic to small dogs
  • Sugar Free Candy — Sugar-free mints, sugar-free chocolate
    Check labels - often contains xylitol
  • Baked Goods — Sugar-free cookies, diabetic desserts, keto products
    Increasingly common in low-carb/keto baked goods
  • Peanut Butter — Some sugar-free brands, "natural" brands (occasionally)
    CRITICAL: Some peanut butter brands now contain xylitol - always check labels before giving to dogs
  • Medications — Some chewable vitamins, melatonin gummies, prescription medications
    Can contain xylitol as sweetener
  • Oral Care — Sugar-free toothpaste, mouthwash, dental products
    Common in human oral care products
  • Food — processed food, beverages, candy, baked goods

Safer alternatives

Lower-risk approaches that achieve a similar outcome to Xylitol:

  • Stevia (for human use) — Effective sweetener, appears safe for dogs in small amounts
    Trade-offs: Different taste profile than xylitol
    Relative cost: 1.2-2×
  • Erythritol (for human use) — Sugar alcohol like xylitol but appears safer for dogs
    Trade-offs: May still cause GI upset in large amounts. Less data on dog safety.
    Relative cost: 1.2-2×

Frequently asked questions

Is xylitol safe for pets?

EXTREMELY TOXIC to dogs - causes rapid insulin release and potentially fatal liver failure.

What products contain xylitol?

Xylitol appears in: Ice Breakers (sugar free gum); Trident (sugar free gum); Sugar-free mints (sugar free candy); sugar-free chocolate (sugar free candy); Sugar-free cookies (baked goods).

What are the symptoms of xylitol exposure?

Reported symptoms include: Vomiting (within 30 min - 2 hours, per ASPCA); Weakness/lethargy (per ASPCA); Loss of coordination/ataxia (per veterinary literature); Tremors or seizures (with severe hypoglycemia, per ASPCA); Collapse (per ASPCA).

What should I do if my pet is exposed to xylitol?

EMERGENCY - Call ASPCA Poison Control (888-426-4435) and go to emergency vet IMMEDIATELY. Time-sensitive: best outcomes with treatment within 30 minutes. Do not wait for symptoms.

Why do regulators disagree about xylitol?

Xylitol has been classified by 3 agencies including FDA, EPA CTX / Genetox, EPA CTX / Genetox, with differing conclusions. Regulators apply different standards of evidence (animal data weighting, exposure-pattern assumptions, epidemiological power thresholds), which is why two scientific bodies can review the same data and reach different conclusions. See the regulatory consensus table on this page for the full picture.

See Xylitol in the pets app

Look up products containing xylitol, compare to alternatives, and explore the full data record.

Open in pets View raw API data

Sources (4)
  1. FDA GRAS Notice - Xylitol (2019) — fda
  2. Gastrointestinal Tolerance of Xylitol in Humans — clinical
  3. ASPCA Animal Poison Control - Xylitol Toxicity — vet
  4. Xylitol Toxicosis in Dogs (2006) — vet

Reference data, not professional advice. Aggregates publicly available regulatory and scientific data; not a substitute for veterinary, medical, legal, or regulatory advice. Why we built ALETHEIA →