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Breed profile · FDA CVM July 2026 extract

Terrier - Jack Russell adverse-event record

Adverse-event filings for Terrier - Jack Russell (Dog) in the FDA Center for Veterinary Medicine openFDA extract. Browse dog breeds, reactions, and outcomes below.

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#18 of 510
by report volume (all breeds)
10,423
FDA CVM reports on file
3.7%
death-coded share of reports
#197 of 275
by death-coded share (≥50 reports)

How the 10,423 reports break down

By recorded gender -- every report on file for Terrier - Jack Russell, no filtering.

Annual report volume

Annual adverse-event report trend Yearly FDA CVM adverse-event report counts for this breed. 627 470.25 313.5 156.75 0 2019 2020 2021 2022 2023 2024 2025 2026 Reports filed Death-coded reports
Annual report volume for Terrier - Jack Russell drawn from FDA CVM filings.

Data updated September 2026

The verdict

According to the FDA Center for Veterinary Medicine openFDA adverse-event extract, Terrier - Jack Russell ranks #18 of 510 by total reports (10,423) and #197 of 275 by death-coded share (3.7%). National dual: Retriever - Labrador is #1 of 510 by total adverse-event reports (93,675) at death-coded-share rank 195 of 275 breeds with at least 50 reports (3.7%); separately, Atlantic Salmon (Salmo salar) is #1 highest death-coded share at 99.0% (report rank #233).

93,675
Retriever - Labrador reports (#1)
99.0%
Atlantic Salmon (Salmo salar) death share (#1)
#18
This breed, reports of 510
#197
This breed, death share of 275

Report volume reflects how common a breed or drug is and how often owners and vets file — not actual risk. Death-coded share ranks are limited to entries with enough reports to be meaningful. The two maps do not agree at #1.

Release-over-release change

What changed in the latest FDA data snapshot

PlainBreed reconstructed the prior snapshot from dated openFDA partitions through 2025 Q4, then compared it with the 2026-07-27 openFDA export. Terrier - Jack Russell has 10,423 reports now versus 10,342 in that prior snapshot: 81 more (0.8%).

Report change
+81
Death-coded reports
+3
Death-coded share
+0.0 pts

This compares reported-event counts in two source snapshots. It does not establish a change in real-world risk, product safety, or disease incidence.

Subscribe to Terrier - Jack Russell changes

Total Reports

10,423

Highest-reported breed

Deaths Reported

383

of 10,423 reports

Death-coded share of reports

3.7%

Below-median death-coded share

Avg Age at Report

6.8 yr

8.6 kg avg weight

Breed Safety Scorecard

B- (69/100)

A weighted composite across 4 of 4 dimensions, each benchmarked against every tracked breed with at least 200 reports (n=185). Dimensions with insufficient data drop out and their weight redistributes to the rest, so a missing input never silently deflates the score.

Death rate B
3.7%

Share of reports coded as a fatality

Euthanasia rate B-
1.8%

Share of reports resulting in euthanasia

Full recovery rate C+
31.7%

Share of reports coded "Recovered/Normal"

5-year trend B
-11%

Change in annual report volume over the last 5 complete years

Death-Coded Outcome Share

Terrier - Jack Russell death-coded reports 3.7%
Cross-breed median

3.7% of 10,423 terrier - jack russell reports involved a death outcome.

How to read this number

Read alongside breed popularity, veterinary access, and owner awareness, these shape how many events ever reach the FDA. The comparison line marks the cross-breed median death-coded share (4.8%) among breeds with 50 or more reports; values above it suggest higher reporting bias toward severe outcomes, not necessarily higher true mortality.

Where Terrier - Jack Russell's death-coded share sits among indexed breeds

Death-coded share of FDA CVM reports, breeds with ≥50 reports (July 2026 extract)

4% 28th percentile Higher share than 28% of 275 indexed breeds

5%–10%: 1 indexed breeds (0%). This entry sits in this band. 20%–25%: 2 indexed breeds (1%). Above this entry. 25%–30%: 3 indexed breeds (1%). Above this entry. 30%–35%: 4 indexed breeds (1%). Above this entry. 35%–40%: 5 indexed breeds (2%). Above this entry. 40%–45%: 6 indexed breeds (2%). Above this entry. 45%–50%: 3 indexed breeds (1%). Above this entry. 50%–55%: 7 indexed breeds (3%). Above this entry. 55%–60%: 7 indexed breeds (3%). Above this entry. 60%–65%: 21 indexed breeds (8%). Above this entry. 65%–70%: 11 indexed breeds (4%). Above this entry. 70%–75%: 15 indexed breeds (5%). Above this entry. 75%–80%: 13 indexed breeds (5%). Above this entry. 80%–85%: 11 indexed breeds (4%). Above this entry. 85%–90%: 12 indexed breeds (4%). Above this entry. 90%–95%: 12 indexed breeds (4%). Above this entry. 95%–100%: 142 indexed breeds (52%). Above this entry. Terrier - Jack Russell 5% 100% every breed with ≥50 FDA reports, bucketed by value

Each bar is a band; taller bars hold more indexed breeds. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.

Source FDA Center for Veterinary Medicine, openFDA adverse event extract (PlainBreed) · July 2026 extract

This histogram uses the same ≥50-report cohort as the highest death-coded share ranking. A higher share means more of this breed's reported events were death-coded, not a mortality rate for living animals.

Terrier - Jack Russell among report-volume vs. death-rate peers

Every breed shown has at least 50 filed reports. Volume reflects how often a breed is reported, not how common it is; death rate is the share of a breed's own reports coded as a death outcome.

Source: FDA openFDA Animal & Veterinary Adverse Events database 2×2 strategic matrix plotting 30 entities by Total Reports (X) and Death Rate (%) (Y), with a crosshair dividing the plot into four quadrants. High volume, high death rateLow volume, high death rateHigh volume, low death rateLow volume, low death rate 020,00040,00060,00080,000100,000 0%5%10%15% Total Reports Death Rate (%) Terrier - Jack Russell vs. all breeds, report volume and death-coded share Retriever - Labrador-93675, 3.7%Crossbred Canine/dog-70591, 3.2%Domestic Shorthair-65226, 7.2%Dog (unknown)-48820, 8.8%Retriever - Golden-35980, 3.7%Shepherd Dog - German-32220, 4.4%Chihuahua-31521, 4.2%Terrier - Yorkshire-24924, 3.7%Shih Tzu-24405, 3.6%Boxer (German Boxer)-19405, 4.4%Beagle-17970, 3.6%Pit Bull-17865, 3.1%Shepherd Dog - Australian-16274, 3.7%Terrier (unspecified)-14058, 3.1%Maltese-13940, 3.2%Dachshund (unspecified)-13512, 4.6%Cat (unknown)-13248, 9.3%Terrier - Jack Russell-10423, 3.7%Collie - Border-10130, 4.3%Siberian Husky-9811, 4.5%Domestic Longhair-9615, 7%Pug-9224, 5.2%Spitz - German Pomeranian-9086, 4.9%Terrier - Bull - American Pit-8769, 4.7%Cattle Dog - Australian (blue heeler, red heeler, Queensland cattledog)-7871, 3.6%Terrier - Boston-7737, 4.5%Spaniel - Cocker American-7640, 4%Domestic (unspecified)-7576, 13.4%Poodle (unspecified)-7534, 3.4%Schnauzer - Miniature-7513, 4.4%
Source: FDA openFDA Animal & Veterinary Adverse Events database
Average weight at time of report: 8.6 kg (19.0 lbs)

Top Reported Reactions

Vomiting 2,180
Lethargy (see also Central nervous system depression in 'Neurological') 1,033
Emesis 1,016
Lack of efficacy (ectoparasite) - flea 971
Diarrhoea 690
Lack of efficacy - NOS 610
INEFFECTIVE, HEARTWORM LARVAE 478
Lack of efficacy (endoparasite) - heartworm 462
Lack of efficacy (endoparasite) - hookworm 452
Seizure NOS 445
Anorexia 352
Pruritus 284
Behavioural disorder NOS 283
Digestive tract disorder NOS 261
Shaking 256

Most Referenced Drugs

Milbemycin Oxime + Spinosad 2,182
Spinosad 1,044
Ivermectin + Pyrantel As Pamoate Salt 891
Afoxolaner 653
Moxidectin 508
Fluralaner Chew Tablets 442
Oclacitinib Maleate 440
Pyrantel Pamoate;Sarolaner 411
Trilostane 316
Milbemycin Oxime + Praziquantel 274
Fluralaner 13.64% 12-Week Chew 239
Carprofen 203
Nitenpyram 203
Sarolaner 202
Selamectin 155

Outcome Breakdown

Recovered/Normal
3,304 (34.8%)
Outcome Unknown
3,216 (33.9%)
Ongoing
2,181 (23.0%)
Recovered with Sequela
408 (4.3%)
Died
198 (2.1%)
Euthanized
185 (1.9%)

Gender Distribution

Male 5,237 (50.2%)
Female 4,954 (47.5%)
Unknown 207 (2.0%)
Mixed 25 (0.2%)

Reports by Year

Year Reports Trend
2010 505
2011 675
2012 854
2013 839
2014 817
2015 913
2016 864
2017 780
2018 680
2019 627
2020 575
2021 482
2022 418
2023 450
2024 453
2025 430
2026 61

Terrier - Jack Russell: low death-coded share in the FDA CVM extract

Signature read: 10,423 reports place Terrier - Jack Russell in the upper third of breed filing volume (#18 of 510). According to FDA CVM filings indexed on PlainBreed as of July 2026 extract, Terrier - Jack Russell sits at #18 of 510 by report volume among all breeds and #16 of 298 among dog breeds, with 10,423 reports and 383 (3.7%) death-coded. On death-coded share among breeds with ≥50 reports, it ranks #197 of 275. Mean age at report: 6.8 years, average weight 8.6 kg (19.0 lbs).

Top reported signs: Vomiting (2,180), Lethargy (see also Central nervous system depression in 'Neurological') (1,033), Emesis (1,016). Most-referenced drug: Milbemycin Oxime + Spinosad (2,182 reports), followed by Spinosad (1,044) and Ivermectin + Pyrantel As Pamoate Salt (891).

Outcome coding on 9,492 status-recorded reports is dominated by Recovered/Normal (34.8%). Annual submissions ranged 61-2,026 across 17 years on file.

Terrier - Jack Russell Reporting Concentration Profile

Terrier - Jack Russell is a high-volume FDA CVM cohort (10,423 reports) - enough filings to measure how concentrated the reaction and drug mix is, not just the headline totals. Across 20 named reaction terms in the stored top list, the leading three (Vomiting, Lethargy (see also Central nervous system depression in 'Neurological'), Emesis) account for 38.6% of listed reaction mentions. The Herfindahl index on that list is 0.085 (1.0 = a single reaction owns every mention; lower = a broader clinical mix).

On the drug side, 20 referenced products appear in the top list; the leading three (Milbemycin Oxime + Spinosad, Spinosad, Ivermectin + Pyrantel As Pamoate Salt) cover 46.5% of those mentions. That multi-product footprint is the profile thin-report breeds cannot show - their pages stop at a short bar list because the sample cannot support a concentration read.

Outcome coding on 9,492 status-recorded filings splits roughly 4.0% severe (died or euthanized - 383 reports) versus 39.1% recovered or recovered-with-sequela (3,712). Read that split next to the 3.7% death-coded share above - both track reporting severity bias in a popular breed, not a proven mortality rate.

Peak filing year was 2015 (913 reports); the lightest year on file was 2026 (61). From 2024 to 2025, annual volume fell 5.1% (453 → 430). Year-to-year swings at this volume usually track product launches, owner awareness, and reporting campaigns more than sudden breed-health shocks.

Dog Breeds With a Similar Report Volume

Showing 6 of 297 dog breeds in our dataset, ranked by closest report volume.

Collie - Border
10,130 reports · 4.3% death-coded
Siberian Husky
9,811 reports · 4.5% death-coded
Pug
9,224 reports · 5.2% death-coded
Spitz - German Pomeranian
9,086 reports · 4.9% death-coded
Terrier - Bull - American Pit
8,769 reports · 4.7% death-coded
Cattle Dog - Australian (blue heeler, red heeler, Queensland cattledog)
7,871 reports · 3.6% death-coded

Nationwide breeds with similar profiles

High-volume peer sets for Terrier - Jack Russell drawn from openFDA outside the Dog family so the neighborhoods are not species containment (the similar-volume list above stays within species).

Similar death-coded share

Nearest other-species breeds with ≥50 reports (3.7% death-coded here).

British cat 3.8% · Cat American Curl Shorthair 3.5% · Cat Oriental 3.1% · Cat Siberian 4.2% · Cat

Similar average weight

Nearest other-species breeds by reported average weight (8.6 kg here).

Nigerian Dwarf 7.5 kg · Goat Primate (other) 10.1 kg · Primate Maine Coon 6.1 kg · Cat Norwegian Forest 5.8 kg · Cat

What to do with this dog

A report does not prove a drug caused the reaction, and popular breeds simply generate more reports.

Frequently Asked Questions

How many FDA adverse event reports involve Terrier - Jack Russell? ▼
There are 10,423 adverse event reports involving Terrier - Jack Russell in the FDA database, of which 383 were death-coded (3.7% of those reports). That is a share of REPORTED events, not a mortality rate for the breed: adverse events reach the FDA when something goes wrong, so the denominator is reports, never the population of animals. According to the same FDA CVM extract, Terrier - Jack Russell ranks #18 of 510 by report volume among all breeds PlainBreed indexes (#16 of 298 among dog breeds).
Where does Terrier - Jack Russell sit among other breeds in PlainBreed's corpus? ▼
According to FDA CVM report volume, Terrier - Jack Russell is #18 of 510 breeds indexed on PlainBreed (same ordering as the most-reported-breeds ranking). Inside Dog, it is #16 of 298. Among breeds with at least 50 reports, its death-coded share ranks #197 of 275 (same cohort as highest-death-rate). These are placement ranks in the reporting corpus, not clinical risk scores.
What are the most common adverse reactions reported for Terrier - Jack Russell? ▼
The most commonly reported adverse reactions for Terrier - Jack Russell are Vomiting (2,180 reports), Lethargy (see also Central nervous system depression in 'Neurological') (1,033 reports), Emesis (1,016 reports), Lack of efficacy (ectoparasite) - flea (971 reports), Diarrhoea (690 reports).
What drugs are most frequently associated with Terrier - Jack Russell adverse events? ▼
The drugs most frequently referenced in Terrier - Jack Russell adverse event reports are Milbemycin Oxime + Spinosad (2,182 reports), Spinosad (1,044 reports), Ivermectin + Pyrantel As Pamoate Salt (891 reports), Afoxolaner (653 reports), Moxidectin (508 reports).
What is the average age of Terrier - Jack Russell in adverse event reports? ▼
The average age of Terrier - Jack Russell at the time of adverse event reports is 6.8 years, with an average weight of 8.6 kg (19.0 lbs).

Compare a breed's report volume against how common the breed is before drawing conclusions. See our methodology for how the death-coded share and rankings are computed, or read breed-specific reporting patterns and FDA CVM reporting.

Source: FDA Center for Veterinary Medicine openFDA Animal & Veterinary Adverse Events (CVM AER) · 2025

openFDA Animal & Veterinary Adverse Events (FDA CVM) for Terrier - Jack Russell (Dog), extract as of July 2026 extract. 10,423 reports · 383 death-coded (3.7% of reports, not a mortality rate) · #18 of 510 by volume.

Informational only. FDA adverse-event reports are voluntary and do not prove causation; consult a veterinarian before acting on them. Verify with FDA CVM →