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Breed profile · FDA CVM July 2026 extract

Terrier - Boston adverse-event record

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

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#26 of 510
by report volume (all breeds)
7,737
FDA CVM reports on file
4.5%
death-coded share of reports
#153 of 275
by death-coded share (≥50 reports)

How the 7,737 reports break down

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

Annual report volume

Annual adverse-event report trend Yearly FDA CVM adverse-event report counts for this breed. 560 420 280 140 0 2019 2020 2021 2022 2023 2024 2025 2026 Reports filed Death-coded reports
Annual report volume for Terrier - Boston drawn from FDA CVM filings.

Data updated September 2026

The verdict

According to the FDA Center for Veterinary Medicine openFDA adverse-event extract, Terrier - Boston ranks #26 of 510 by total reports (7,737) and #153 of 275 by death-coded share (4.5%). 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)
#26
This breed, reports of 510
#153
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 - Boston has 7,737 reports now versus 7,637 in that prior snapshot: 100 more (1.3%).

Report change
+100
Death-coded reports
+2
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 - Boston changes

Total Reports

7,737

Highest-reported breed

Deaths Reported

351

of 7,737 reports

Death-coded share of reports

4.5%

Below-median death-coded share

Avg Age at Report

5.7 yr

10.2 kg avg weight

Breed Safety Scorecard

C (59/100)

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 C-
4.5%

Share of reports coded as a fatality

Euthanasia rate C-
2.1%

Share of reports resulting in euthanasia

Full recovery rate B
33.8%

Share of reports coded "Recovered/Normal"

5-year trend B-
-6%

Change in annual report volume over the last 5 complete years

Death-Coded Outcome Share

Terrier - Boston death-coded reports 4.5%
Cross-breed median

4.5% of 7,737 terrier - boston 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 - Boston's death-coded share sits among indexed breeds

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

5% 44th percentile Higher share than 44% 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 - Boston 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 - Boston 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 - Boston 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: 10.2 kg (22.5 lbs)

Top Reported Reactions

Vomiting 1,621
Emesis 833
Lethargy (see also Central nervous system depression in 'Neurological') 674
Diarrhoea 562
Lack of efficacy (endoparasite) - hookworm 445
Lack of efficacy - NOS 410
Seizure NOS 380
Lack of efficacy (ectoparasite) - flea 332
INEFFECTIVE, HEARTWORM LARVAE 265
Lack of efficacy (endoparasite) - heartworm 258
Anorexia 240
Digestive tract disorder NOS 237
Elevated alanine aminotransferase (ALT) 226
Other abnormal test result NOS 222
Behavioural disorder NOS 190

Most Referenced Drugs

Milbemycin Oxime + Spinosad 1,572
Trilostane 677
Ivermectin + Pyrantel As Pamoate Salt 652
Spinosad 555
Moxidectin 454
Oclacitinib Maleate 384
Afoxolaner 376
Pyrantel Pamoate;Sarolaner 356
Fluralaner Chew Tablets 298
Milbemycin Oxime + Praziquantel 230
Fluralaner 13.64% 12-Week Chew 163
Carprofen 146
Sarolaner 133
Maropitant Citrate 121
Selamectin 120

Outcome Breakdown

Recovered/Normal
2,617 (36.6%)
Outcome Unknown
2,213 (30.9%)
Ongoing
1,708 (23.9%)
Recovered with Sequela
264 (3.7%)
Died
190 (2.7%)
Euthanized
161 (2.3%)

Gender Distribution

Female 3,791 (49.0%)
Male 3,782 (48.9%)
Unknown 146 (1.9%)
Mixed 18 (0.2%)

Reports by Year

Year Reports Trend
2010 298
2011 433
2012 618
2013 629
2014 594
2015 562
2016 517
2017 580
2018 479
2019 560
2020 451
2021 407
2022 371
2023 399
2024 386
2025 384
2026 69

Terrier - Boston: high-volume FDA adverse-event cohort

Signature read: 7,737 reports place Terrier - Boston in the upper third of breed filing volume (#26 of 510). According to FDA CVM filings indexed on PlainBreed as of July 2026 extract, Terrier - Boston sits at #26 of 510 by report volume among all breeds and #23 of 298 among dog breeds, with 7,737 reports and 351 (4.5%) death-coded. On death-coded share among breeds with ≥50 reports, it ranks #153 of 275. Mean age at report: 5.7 years, average weight 10.2 kg (22.5 lbs).

Top reported signs: Vomiting (1,621), Emesis (833), Lethargy (see also Central nervous system depression in 'Neurological') (674). Most-referenced drug: Milbemycin Oxime + Spinosad (1,572 reports), followed by Trilostane (677) and Ivermectin + Pyrantel As Pamoate Salt (652).

Outcome coding on 7,153 status-recorded reports is dominated by Recovered/Normal (36.6%). Annual submissions ranged 69-2,026 across 17 years on file.

Dog Breeds With a Similar Report Volume

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

Spaniel - Cocker American
7,640 reports · 4.0% death-coded
Cattle Dog - Australian (blue heeler, red heeler, Queensland cattledog)
7,871 reports · 3.6% death-coded
Poodle (unspecified)
7,534 reports · 3.4% death-coded
Schnauzer - Miniature
7,513 reports · 4.4% death-coded
Bulldog - French
7,272 reports · 4.4% death-coded
Bulldog
7,268 reports · 4.7% death-coded

Nationwide breeds with similar profiles

High-volume peer sets for Terrier - Boston 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 (4.5% death-coded here).

Bengal 4.6% · Cat Scottish Fold Longhair 4.8% · Cat Siberian 4.2% · Cat Egyptian Mau 5.3% · Cat

Similar average weight

Nearest other-species breeds by reported average weight (10.2 kg here).

Primate (other) 10.1 kg · Primate Monkey (unspecified) 11.6 kg · Monkey Nigerian Dwarf 7.5 kg · Goat Maine Coon 6.1 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 - Boston? ▼
There are 7,737 adverse event reports involving Terrier - Boston in the FDA database, of which 351 were death-coded (4.5% 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 - Boston ranks #26 of 510 by report volume among all breeds PlainBreed indexes (#23 of 298 among dog breeds).
Where does Terrier - Boston sit among other breeds in PlainBreed's corpus? ▼
According to FDA CVM report volume, Terrier - Boston is #26 of 510 breeds indexed on PlainBreed (same ordering as the most-reported-breeds ranking). Inside Dog, it is #23 of 298. Among breeds with at least 50 reports, its death-coded share ranks #153 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 - Boston? ▼
The most commonly reported adverse reactions for Terrier - Boston are Vomiting (1,621 reports), Emesis (833 reports), Lethargy (see also Central nervous system depression in 'Neurological') (674 reports), Diarrhoea (562 reports), Lack of efficacy (endoparasite) - hookworm (445 reports).
What drugs are most frequently associated with Terrier - Boston adverse events? ▼
The drugs most frequently referenced in Terrier - Boston adverse event reports are Milbemycin Oxime + Spinosad (1,572 reports), Trilostane (677 reports), Ivermectin + Pyrantel As Pamoate Salt (652 reports), Spinosad (555 reports), Moxidectin (454 reports).
What is the average age of Terrier - Boston in adverse event reports? ▼
The average age of Terrier - Boston at the time of adverse event reports is 5.7 years, with an average weight of 10.2 kg (22.5 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 - Boston (Dog), extract as of July 2026 extract. 7,737 reports · 351 death-coded (4.5% of reports, not a mortality rate) · #26 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 →