Methodology: How We Verify the Sources Behind This Site

Last reviewed June 2026Primary sources

This page documents every primary source the site relies on, the math behind the calculators, the boundary between what we cover and what we do not, the refresh cadence for each data type, and our corrections process. If a page on this site disagrees with what is documented here, the methodology is canonical and the page is the bug.

Primary Sources

Toxicology thresholds, nutritional facts, pesticide framing, and clinical protocols all come from named authoritative sources. We do not paraphrase secondary blogs.

Source	URL pattern	Refresh	What we take from it
ASPCA Animal Poison Control Center	aspca.org/pet-care/animal-poison-control	On revision	Xylitol toxicity reference; 24/7 emergency triage protocol referenced from /xylitol and /emergency.
Pet Poison Helpline	petpoisonhelpline.com/pet-safety-tips/my-dog-just-ate-xylitol-gum-is-xylitol-poisonous-to-dogs/	Quarterly	The 24/7 emergency number, and the corroborating dose statement that the dose needed to cause poisoning is at least 0.05 grams per pound of body weight (0.1 grams per kilogram). We take no brand-level product claims from it, and it publishes no per-product xylitol quantity.
AVMA (American Veterinary Medical Association)	avma.org	Annual	Veterinary professional standards framing for not-medical-advice positioning and editorial standards.
AAHA (American Animal Hospital Association)	aaha.org	Annual	Canine nutritional guideline positioning, including 10% daily-treat-calorie framing alignment.
VCA Animal Hospitals - Xylitol Poisoning in Dogs	vcahospitals.com/know-your-pet/xylitol-toxicity-in-dogs	On revision (re-read 7 September 2026)	Consumer guidance on the mechanism, clinical signs and treatment of xylitol poisoning. It publishes no numeric dose thresholds and no per-product quantity, so it is no longer cited for either.
USDA FoodData Central #09316 (Strawberries, raw)	fdc.nal.usda.gov/fdc-app.html#/food-details/167762/nutrients	Stable	Nutrition data for strawberries: 32 kcal per 100g, 4.9g sugar, 2g fibre, 59mg vitamin C, 0.7g protein. Anchors the portion calculator math.
EWG Shopper's Guide to Pesticides in Produce (Dirty Dozen)	ewg.org/foodnews	Annual	Pesticide framing on /preparation. Strawberries topped the Dirty Dozen list for nine straight years and still rank in the top few (#3 in 2026), anchoring the wash-thoroughly step.
AAFCO (Association of American Feed Control Officials)	aafco.org	Annual	Complete-and-balanced diet standards that underpin the 10% treat rule (treats supplement, do not replace, the 90% from AAFCO-compliant food).
FDA consumer update, Paws Off Xylitol; It's Dangerous for Dogs	fda.gov/consumers/consumer-updates/paws-xylitol-its-dangerous-dogs	As FDA revises (content current as of 17 December 2025)	The product categories in which xylitol is found, the alternative names (birch sugar, wood sugar) and the read-the-label instruction on /xylitol. The FDA publishes no register of individual products, which is why the page carries no brand list beyond products read from a manufacturer's own panel.
Manufacturer ingredient listings (product pages, FDA DailyMed drug labels, SmartLabel panels)	per-product, linked from each verdict on /xylitol	Re-read on every review; verdicts carry the date they were checked	The only permitted basis for naming a product on /xylitol. A product verdict is published only when the manufacturer's own current panel supports it, and a claim that cannot be traced to one is removed rather than hedged.
MSD Veterinary Manual, Xylitol Toxicosis in Dogs	msdvetmanual.com/toxicology/food-hazards/xylitol-toxicosis-in-dogs	On revision (checked 7 September 2026)	The source of the two dose thresholds used by the xylitol calculator and the emergency protocol: hypoglycaemia associated with doses above approximately 100 mg/kg (45 mg/lb), and severe hepatic insufficiency or failure in some dogs above 500 mg/kg (227 mg/lb). Published as the Merck Veterinary Manual in the US.
American College of Veterinary Pharmacists, xylitol entry	vetmeds.org/pet-poison-control-list/xylitol/	On revision (checked 7 September 2026)	Independent confirmation of both dose thresholds, and the only per-product xylitol quantity we publish: gums usually contain 300 to 2,000 mg of xylitol per piece, and a cup of granulated xylitol weighs approximately 190 g.
Dunayer EK, Gwaltney-Brant SM. Acute hepatic failure and coagulopathy associated with xylitol ingestion in eight dogs. J Am Vet Med Assoc. 2006;229(7):1113-1117	pubmed.ncbi.nlm.nih.gov/17014359/	Stable (peer-reviewed)	The case series that first described hepatic failure after xylitol ingestion in dogs. Anchors the liver-injury half of the risk banding and the 12 to 72 hour window in the symptom timeline.
Schmid RD, Hovda LR. Acute Hepatic Failure in a Dog after Xylitol Ingestion. J Med Toxicol. 2016;12(2):201-205	pubmed.ncbi.nlm.nih.gov/26691320/	Stable (peer-reviewed)	Documented course in a 4.95 kg dog that ate 224 g of granulated xylitol (45 g/kg): hypoglycaemia within 1 to 2 hours, raised liver values within 12 hours, coagulopathy inside 24 hours. Anchors the 0 to 72 hour symptom timeline and is the highest published dose survived by a dog.
Murphy LA, Dunayer EK. Xylitol Toxicosis in Dogs: An Update. Vet Clin North Am Small Anim Pract. 2018;48(6):985-990	pubmed.ncbi.nlm.nih.gov/30064708/	Stable (peer-reviewed)	Current veterinary review of xylitol toxicosis in dogs, used as the general clinical frame for /xylitol and /emergency.

In Scope

+Head-term yes/no answer for fresh strawberries with the three rules (fresh only, washed, small portions).
+Dose-by-weight portion guidance using the 10% daily-treat-calorie rule with explicit RER math (70 x kg^0.75) per AAHA / AAFCO framing.
+Xylitol dose thresholds per the MSD Veterinary Manual and the American College of Veterinary Pharmacists, with Dunayer 2006, Schmid and Hovda 2016 and Murphy and Dunayer 2018 as the peer-reviewed frame, and a product audit built only on manufacturer ingredient listings.
+Preparation steps including the EWG Dirty Dozen pesticide framing for washing and the calyx / leaves removal step.
+Emergency protocol with ASPCA / Pet Poison Helpline / UK Animal Poison Line / AU Animal Poisons Helpline phone numbers and the do-not-induce-vomiting step.
+Per-condition adjustments for diabetic dogs, pancreatitis, kidney disease, allergies, seniors, weight management, and calcium-oxalate stone history.
+12 dog-safe, xylitol-free recipes with portion bands by body weight and explicit xylitol-check instructions for every flavoured-ingredient brand.

Out of Scope

xIndividual veterinary diagnosis for a specific dog. We provide general nutritional and toxicology framing; clinical decisions require the dog's own vet.
xSpecific clinic pricing quotes for emergency xylitol treatment. We do not list named-clinic costs because they vary by region, time of day, and case complexity.
xClaims that any strawberry-flavoured human product is safe without a current ingredient-label check. Manufacturer formulations change.
xDialysis decision-making or off-label treatment guidance for severe xylitol overdose.
xNon-strawberry fruit toxicity outside the cluster cross-links (apples, grapes, watermelon). For other fruits, see the cluster sites or your vet.
xCommercial pet-food formulation reviews. We are not a pet-food rating site.

Calculation Framework

Every number on the site reduces to one of the frameworks below. If a page shows a calculator output or a portion table, the underlying math is documented here.

Portion calculator math

RER (resting energy requirement) at maintenance: 70 x (body weight in kg)^0.75. Treat budget: 10% of daily kcal per veterinary nutrition guidance. Strawberry energy density: 32 kcal per 100g (USDA #09316). Medium-berry standard: 12g, 4 kcal. Conversion: treat-kcal divided by 0.32 = max strawberry grams; max grams divided by 12 = medium-berry count. Capped at 8 medium berries / day for dogs over 30 kg.

Xylitol risk-band thresholds

Two published thresholds, from the MSD Veterinary Manual and confirmed independently by the American College of Veterinary Pharmacists: hypoglycaemia associated with doses above approximately 100 mg/kg (0.1 g/kg, 45 mg/lb), and severe hepatic insufficiency or failure in some dogs above 500 mg/kg (0.5 g/kg, 227 mg/lb). The calculator divides the grams entered by body weight and compares. A fourth band at 0.05 g/kg is our own precaution and is labelled in the interface as not being a published threshold. Calculator, /xylitol and /emergency all read the same figures from one module, src/lib/xylitol-anchors.ts. These are reported onset points, not safe-dose points. Corrected on 7 September 2026: the risk bands were previously attributed to two peer-reviewed papers whose citations did not resolve to xylitol research at all.

Per-product xylitol quantities

Only where a named veterinary body publishes one. That is gum, at 300 to 2,000 mg per piece, and granulated xylitol for baking, at approximately 190 g per cup, both from the American College of Veterinary Pharmacists. On 7 September 2026 we withdrew estimated figures for breath mints, 'light' yoghurt, protein bars, toothpaste tubes and 'no sugar added' jam: they were labelled 'estimates from publicly available data' and no manufacturer listing or veterinary reference publishes a quantity for any of them. In a calculator that grades a poisoning, an invented milligram figure is worse than an absent one, so they were removed rather than hedged.

Product audit basis

A product is named on /xylitol only when the manufacturer's own current ingredient listing supports the verdict, with a link to that panel and the date it was read. The category risk ratings the page used to carry were removed on 7 September 2026 because they graded invented categories; the FDA's own published list of product categories that contain xylitol does that job instead.

Recipe portion scaling

12 dog-safe recipes on /recipes scale to small dog (under 8 kg), medium dog (8-25 kg), and large dog (over 25 kg) bands. Per-recipe kcal calculations use USDA values for strawberry plus the named ingredient (peanut butter, banana, yoghurt, etc.). Recipes are xylitol-free by design; ingredient checks for plain yoghurt, peanut butter, and coconut yoghurt are flagged on every recipe and on /xylitol.

Condition-specific portion adjustment

Calculator adjustments: diabetic dogs 50% of base portion (low-GI 41 still warrants caution; vet supervises blood glucose), pancreatitis 75% (avoid high-fat coconut / nut recipes), puppies 50% (smaller dice, allergy-introduction protocol). These adjustments are heuristics, not replacement for vet-supervised diet planning.

Refresh Cadence

ASPCA Animal Poison Control Center reviewed on revision. ASPCA does not publish on a calendar cadence; we watch for guidance updates and propagate changes within 7 days.
MSD Veterinary Manual, American College of Veterinary Pharmacists and Pet Poison Helpline xylitol guidance watched quarterly for changes to dose thresholds and treatment advice. We do not take brand-level product claims from any of them, or from any third-party tracker.
Per-product xylitol quantities are re-read at the same cadence. A quantity is published only while a named veterinary body publishes it; if a source drops the figure, we drop it too rather than carry a remembered number forward.
USDA FoodData Central nutritional values for strawberry (#09316) are stable; no scheduled refresh.
EWG Shopper's Guide to Pesticides in Produce updates annually (usually March); we update /preparation when the new Dirty Dozen list publishes.
Product verdicts on /xylitol re-read from the manufacturer's own panel every 3-6 months, because formulations change without industry-wide announcement. Each verdict carries the date it was last checked; a verdict that cannot be re-confirmed against a current panel is removed rather than left standing with an old date.
Single LAST_VERIFIED_DATE constant in src/lib/schema.ts drives every page footer, every JSON-LD dateModified, and every visible "Updated" badge across the site. When we roll the date forward we have re-checked the page, not just bumped a footer string.

Out-of-cycle refresh triggers

New peer-reviewed xylitol dose-response research, or a revision to the MSD Veterinary Manual xylitol entry.
ASPCA APCC guidance revision or a new public case-series report.
Manufacturer reformulation announcement for any brand named in the product audit.
Vaccine, supplement, or medication recall for xylitol-related safety concern.
Flagged correction from a reader, veterinary professional, or manufacturer (5-business-day SLA).

Limitations

Xylitol dose thresholds are clinical guidelines, not safety guarantees. Individual sensitivity varies and the published thresholds (100 mg/kg hypoglycaemia, 500 mg/kg hepatic injury, per the MSD Veterinary Manual) are reported onset points, not safe-dose points.
We cannot tell you how much xylitol is in most products, and neither can anyone else. Gum and granulated xylitol are the only two quantities a veterinary body publishes. Manufacturers are not required to declare the grams of xylitol in a product, and content varies by brand and by flavour within a brand. Any calculator answer is only as good as your estimate of how much went in, which is why every result on this site tells you to call poison control anyway.
Product formulations change without manufacturer announcement. The xylitol product audit is dated and the dates are explicit. Always read the current label on the actual product in your hand.
Pesticide data is industry-aggregate, not specific to any individual punnet. EWG Dirty Dozen rankings reflect average pesticide residue across many tested samples; your specific punnet may differ.
Portion math is for a typical adult dog at maintenance activity. Working dogs, pregnant or lactating dogs, puppies, seniors, and calorie-restricted dogs all need vet-supervised adjustments. The calculator's built-in condition adjustments are heuristics, not clinical prescriptions.
This site does not replace ASPCA APCC consultation for suspected xylitol ingestion, or veterinary consultation for any dog with a diagnosed health condition.

Corrections Process

We welcome corrections from owners, veterinary professionals, and product manufacturers. Email via digitalsignet.com with:

The full URL of the page that needs correction.
The specific sentence or claim that is wrong.
A link or citation to a primary source that supports the proposed change.
Your role (owner, vet, manufacturer, researcher) so we can prioritise expert input.

We aim to respond within 5 business days. Verified corrections are propagated within a further 5 business days; the page's LAST_VERIFIED_DATE is rolled forward only after we have re-checked the rest of the page, not just patched the single claim.

Do not email us for veterinary emergencies. For suspected xylitol ingestion or any acute poisoning, call ASPCA Animal Poison Control on (888) 426-4435 or Pet Poison Helpline on (855) 764-7661 immediately.

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