Methodology & Data Sources

What PlainPetFood Covers

PlainPetFood is a comprehensive food safety reference for pet owners, documenting which human foods are safe, potentially harmful, or toxic for dogs, cats, and other common household pets. Each food entry includes a safety level, recommended portion guidance, preparation notes, potential health benefits, known risks, and symptoms to watch for if a pet consumes something harmful.

Data Sources

Our food safety data is compiled from authoritative veterinary and animal nutrition sources:

• ASPCA Animal Poison Control Center: The ASPCA maintains the most comprehensive toxic and non-toxic plant and food lists for companion animals, based on decades of poison control case data.
• Merck Veterinary Manual: The standard veterinary reference providing toxicology information, including dose-dependent toxicity data for common food items.
• Peer-reviewed veterinary literature: Published research on animal nutrition, food toxicology, and clinical case reports from veterinary journals.
• AVMA and veterinary university resources: Guidance from the American Veterinary Medical Association and veterinary school extension programs on pet nutrition and food safety.

Safety Level Classification

Each food-pet combination is assigned one of four safety levels:

• Safe: The food is generally safe for this pet species when served in appropriate portions and properly prepared. No known toxicity concerns at normal serving sizes.
• Caution: The food can be given in small amounts or with specific preparation requirements, but carries some risk if overfed or improperly prepared. Portion control and preparation guidance are especially important.
• Unsafe: The food poses meaningful health risks and should generally be avoided. May cause gastrointestinal distress, nutritional imbalances, or other health issues.
• Toxic: The food contains compounds that are toxic to this pet species and should never be given. Even small amounts may cause serious illness or be life-threatening. Common examples include chocolate, grapes, onions, and xylitol for dogs.

Safety levels are assigned conservatively. When veterinary sources disagree or when toxicity is dose-dependent with a narrow safety margin, we err toward a more cautious classification.

Research and Curation Process

Our database is built through a structured research process for each food item:

1. Identify the food item and determine which pet species require separate safety assessments (dogs, cats, and others may metabolize foods differently)
2. Research the food's safety profile across multiple veterinary sources, noting any toxic compounds, dose-dependent effects, and species-specific differences
3. Document safe preparation methods (e.g., cooked vs. raw, seeds removed, skin peeled) based on veterinary guidance
4. Establish appropriate portion guidelines relative to pet body weight where available
5. Catalog known benefits (nutritional value) and risks (choking hazards, digestive issues, toxic compounds)
6. Document symptoms of adverse reactions so pet owners know what to watch for

No safety data is generated through inference or extrapolated from human nutrition data. All safety assessments are grounded in veterinary literature specific to each animal species.

Update Schedule

We expand our food database on a rolling basis, adding new food items and updating existing entries as new veterinary research becomes available. When veterinary organizations issue updated guidance on a specific food (such as reclassifying a food's safety status), we update our database accordingly. Each entry reflects the most current veterinary consensus at the time of our last review.

Limitations

• Individual pets may have allergies, sensitivities, or health conditions that make otherwise safe foods inappropriate for them. Always consult your veterinarian about your specific pet's dietary needs.
• Portion guidance is general — appropriate amounts vary based on pet size, breed, age, and overall health.
• Toxicity can be dose-dependent. A food classified as "caution" may be harmless in tiny amounts but dangerous in larger quantities.
• Our database covers common human foods; commercial pet food ingredients and supplements are not evaluated.
• New research may change the safety classification of specific foods. Always check with your veterinarian for the most current guidance.

Emergency Information

If your pet has eaten something potentially toxic, contact your veterinarian or the ASPCA Animal Poison Control Center at (888) 426-4435 immediately. Do not wait for symptoms to appear.

Contact

Questions about our methodology or data? Contact us — we welcome feedback and corrections.