How to Report Pet Adverse Events to the FDA
A practical guide to submitting adverse event reports — who can report, what information is needed, and why your report matters for animal medication safety.
Key Takeaway
The FDA's Center for Veterinary Medicine (CVM) relies on adverse event reports from veterinarians, pet owners, and manufacturers to monitor the safety of animal drugs and products after they reach the market. Anyone can file a report — you do not need a veterinarian's involvement. Each report contributes to the signal detection system that identifies emerging safety problems. The database powering PlainBreed exists because of this reporting infrastructure.
Why Reporting Matters
Pre-market clinical trials for animal drugs typically involve hundreds to a few thousand animals — enough to identify common adverse reactions but not enough to detect rare events that occur in 1 in 10,000 or 1 in 100,000 animals. Post-market surveillance through adverse event reporting fills this gap. It is the only system that monitors drug safety across the millions of animals that receive medications after FDA approval.
Every report that enters the system contributes to signal detection. The FDA's CVM reviews incoming reports for patterns — clusters of similar reactions to a specific product, unexpected reactions in certain breeds or species, or increasing frequency of known side effects. These signals have led to real safety actions: label changes for isoxazoline flea and tick products (neurological warnings added), safety alerts for specific compounded medications, and in some cases, product withdrawals.
Under-reporting is the primary weakness of the system. The FDA estimates that only a fraction of actual adverse events are reported — particularly for non-serious reactions that resolve on their own. When pet owners and veterinarians do not report, real safety signals can be delayed or missed entirely. PlainBreed's breed profiles and reaction data reflect only what has been reported, not the full universe of adverse events.
Three Ways to Report
The FDA accepts adverse event reports through three channels:
- FDA Safety Reporting Portal (recommended)
The online portal at safetyreporting.hhs.gov is the most efficient method. Select "Veterinary" under product type, then follow the guided form. You can save a draft and return later if you need to gather information. The form takes 15-30 minutes to complete depending on the complexity of the event. You will receive a confirmation number upon submission.
- Phone (1-888-FDA-VETS)
Call the FDA's veterinary adverse event reporting line. A representative will walk you through the information needed and submit the report on your behalf. This option is useful if you are uncomfortable with online forms or need to describe a complex situation verbally. Available during business hours (Eastern Time).
- Through the product manufacturer
Contact the manufacturer of the product involved. Every FDA-approved animal drug label includes a phone number for adverse event reporting. Manufacturers are legally required to forward all reports to the FDA. This method is convenient but adds a step — the report goes to the manufacturer first, then to the FDA. If time is critical or you want to ensure the FDA receives the report directly, use the portal or phone line.
What Information to Include
The more detail you provide, the more useful your report is for signal detection. The FDA requests the following information (provide what you can — a partial report is better than no report):
- Animal information: Species, breed, age, weight, sex, reproductive status (spayed/neutered), and any pre-existing conditions. Breed is particularly important for signal detection — see our guide on breed-specific risks.
- Product details: Exact product name, manufacturer, lot number (if available from the packaging), dosage administered, route of administration (oral, topical, injectable), and how long the animal had been taking the product.
- Reaction description: What happened, when symptoms began relative to administration, the severity and duration of symptoms, and the outcome (recovered, ongoing, hospitalized, died). Be as specific as possible — "vomiting 3 times within 2 hours of administration" is more useful than "got sick."
- Other medications: List all other medications, supplements, flea/tick products, and treatments the animal was receiving at the time. Drug interactions are a significant source of adverse events and cannot be detected without this information.
- Veterinary records: If available, attach or reference medical records from the treating veterinarian. Lab results, imaging, and clinical notes strengthen the report significantly.
What Happens After You Report
After submission, your report enters the FDA CVM's adverse event database — the same database that powers the openFDA API and, by extension, PlainBreed's analysis. Here is what happens next:
- Data entry and coding. Your report is coded using standardized terminology for the species, breed, reaction type, product, and outcome. This coding enables statistical analysis across millions of reports.
- Signal detection review. The CVM's pharmacovigilance team reviews incoming reports as part of ongoing surveillance. Individual serious reports (deaths, life-threatening events) may receive immediate attention. Non-serious reports are aggregated for pattern analysis.
- Signal evaluation. If a pattern is detected — an unusual number of similar reactions for a specific product, an unexpected breed sensitivity, or an increase in serious outcomes — the CVM conducts a deeper evaluation. This may involve reviewing clinical literature, consulting with veterinary specialists, or requesting additional data from the manufacturer.
- Regulatory action (if warranted). Confirmed safety signals can result in: updated product labeling with new warnings, Dear Veterinarian letters alerting practitioners to new risks, public safety communications, mandatory post-market studies, or product recall/withdrawal.
You will not typically receive personal follow-up on your report unless the FDA needs additional information about a particularly significant case. The system is designed for population-level surveillance, not individual case management.
Common Reporting Mistakes to Avoid
Based on patterns visible in the openFDA data, these common issues reduce report quality:
- Omitting breed information. Reports without breed data cannot contribute to breed-specific signal detection. Even "mixed breed — predominantly Labrador" is more useful than leaving the field blank.
- Vague reaction descriptions. "Had a bad reaction" provides almost no analytical value. Specify the symptoms, timing, and severity as precisely as you can.
- Not listing concurrent medications. Drug interactions are a major source of adverse events. Omitting other medications makes it impossible to distinguish product-specific reactions from interactions.
- Waiting too long to report. Details fade with time. Report as soon as reasonably possible after the event, while medical records and observations are fresh.
- Assuming someone else will report. If your veterinarian saw the event, you may assume they reported it. In many cases, they did not — veterinary practices are busy, and reporting is not mandatory for practitioners (only for manufacturers). If in doubt, report it yourself.
Frequently Asked Questions
Who can submit an adverse event report to the FDA?
Anyone can report — veterinarians, pet owners, animal caregivers, veterinary staff, and pharmaceutical company employees. The FDA explicitly encourages pet owners to report adverse events, even without a veterinarian's involvement. Reports can be submitted through the FDA's Safety Reporting Portal (safetyreporting.hhs.gov), by phone (1-888-FDA-VETS), or through the manufacturer of the product involved. Manufacturers are legally required to forward all reports they receive to the FDA within specific timeframes.
Are pharmaceutical companies required to report all adverse events?
Yes. Under FDA regulations, manufacturers and marketing authorization holders must report all adverse events they become aware of, regardless of severity. Serious adverse events (death, life-threatening reactions, hospitalization) must be reported within 15 calendar days. Non-serious events must be reported in periodic summary reports, typically quarterly. Failure to report is a regulatory violation that can result in warning letters, fines, or product withdrawal. This mandatory reporting requirement is the foundation of the surveillance system.
Can I report an adverse event for a supplement or over-the-counter product?
Yes. The FDA CVM adverse event system covers all animal health products, including FDA-approved drugs, conditionally approved drugs, veterinary biologics, medicated feeds, and animal dietary supplements (including those marketed as "treats" with health claims). If your pet had a negative reaction to any product marketed for animal health, you can and should report it. This includes flea and tick products, joint supplements, calming aids, and dental products.
How long after an adverse event should I report it?
There is no deadline for pet owners or veterinarians to submit reports. However, reporting as soon as possible after the event improves data quality — details are fresher, medical records are more accessible, and the temporal connection between the product and the reaction is clearer. If you discover an adverse event weeks or months after it occurred, you should still report it. Late reports contribute to signal detection even if the immediate details are less precise.
Does the FDA investigate every adverse event report?
The FDA does not conduct a field investigation for every individual report. Instead, the CVM uses signal detection — statistical and clinical methods to identify patterns across many reports. When a cluster of similar serious events appears for a specific product, species, or breed, it triggers a deeper review. This review may lead to label changes, Dear Veterinarian letters, safety alerts, or in extreme cases, product recall or withdrawal. Individual reports are the building blocks of this pattern-detection system — each report matters even if it does not trigger an immediate response.
Sources
- FDA Center for Veterinary Medicine — How to Report Animal Drug and Device Side Effects and Product Problems (fda.gov)
- FDA Safety Reporting Portal — safetyreporting.hhs.gov
- 21 CFR Part 514 — New Animal Drug Applications, Subpart B — Administrative Actions on Applications, Adverse Event Reporting
- FDA CVM — Adverse Drug Event Reporting for Animal Drugs
This content is for informational purposes only and does not constitute veterinary advice. Consult your veterinarian about your pet's medications and any adverse events your pet experiences.
