Methodology: How We Verify the Sources Behind This Site

Last reviewed May 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	Quarterly	Xylitol dose thresholds (0.1 g/kg hypoglycaemia, 0.5 g/kg liver failure) and ongoing product database for the xylitol product audit.
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	Clinical reference for xylitol toxicity thresholds, treatment protocols, and symptom timelines.
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 rank #1 on the Dirty Dozen list most years, 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).
Preventive Vet xylitol product tracker	preventivevet.com	Quarterly	Cross-reference for the xylitol product audit; sanity-check brand additions and removals against an independent industry source.
Brutlag and Hommerding 2018 JVECC review	doi.org/10.1111/vec.12796	Stable (peer-reviewed)	Clinical dose-response thresholds and case-series data for xylitol exposure in dogs. Anchors the risk-band thresholds in the xylitol calculator and emergency protocol.
Schmid and Hovda 2017 J Med Toxicol	pubmed.ncbi.nlm.nih.gov/27889880/	Stable (peer-reviewed)	Xylitol exposure case-series with hypoglycaemia and hepatic-injury outcome data. Anchors symptom-timeline framing for the 0-72h emergency window.

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 toxicity thresholds and product audit per Pet Poison Helpline, VCA Animal Hospitals, and Brutlag and Hommerding 2018.
+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 five 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

Low / watch / hypoglycaemia / liver-failure bands based on Brutlag and Hommerding 2018 JVECC review and Pet Poison Helpline / VCA Animal Hospitals clinical thresholds. Hypoglycaemia onset 0.1 g/kg body weight; hepatic injury 0.5 g/kg. Calculator and emergency protocol both reference the same thresholds.

Product audit risk grading

CRITICAL / HIGH / MODERATE-HIGH / MODERATE / VARIABLE risk per product category, based on (a) documented xylitol use across brand variants in that category, (b) palatability and accessibility for dogs (gum and toothpaste high; protein bars moderate), and (c) per-serving xylitol concentration if accidentally consumed (gum stick 0.3-1 g; toothpaste tube 1-3g total).

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.
Pet Poison Helpline product tracker watched quarterly because the tracker is the largest independent source of brand-level xylitol product additions.
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.
Xylitol product audit on /xylitol reviewed every 3-6 months because manufacturer formulations (Yoplait, Trident, Smucker's, Tom's of Maine, Spry, etc.) change without industry-wide announcement.
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 (Brutlag, Schmid, or successor authors).
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 (0.1 g/kg hypoglycaemia, 0.5 g/kg hepatic injury) are statistical onset points, not safe-dose points.
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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