Breed · Horse
Tennessee Walking Horse: adverse event reports
FDA breed label "Tennessee Walking Horse" · single-breed animals only
FDA's database holds 311 reports where the animal's breed is given as "Tennessee Walking Horse", shown here as Tennessee Walking Horse: 1.7% of reports about horses. Reports on crossbred animals are left out of breed pages.
13 reports arrived in the 12 months to March 2026, close to the 12 of the 12 months before. A breed's count mostly mirrors how common the breed is; registration and ownership figures by breed are not public data, so no per-animal rate can be given.
By active ingredient, the drugs named most often are ivermectin + praziquantel, moxidectin and pergolide mesylate. Ivermectin + Praziquantel is named in 17.7% of this breed's reports, about the same share as in reports about all horses (14.4%).
The terms listed most often are death (8.7%), anorexia (8%) and ataxia (8%). Death appears in 8.7% of reports, about the same share as in all horse reports (8.1%). 48.7% of reports stating seriousness were classed as serious, against 44.1% for horses overall.
Drugs named most often, by active ingredient
| Active ingredients recorded for the drug | Reports | Share of Tennessee Walking Horse reports | Share of all horse reports |
|---|---|---|---|
| Ivermectin + Praziquantel | 55 | 17.7% | 14.4% |
| Moxidectin | 35 | 11.3% | 7.4% |
| Pergolide mesylate | 30 | 9.6% | 6.5% |
| Omeprazole | 22 | 7.1% | 9.9% |
| Pyrantel Tartrate | 18 | 5.8% | 4% |
| Ceftiofur Crystalline Free Acid | 16 | 5.1% | 4.8% |
| Flunixin Meglumine | 14 | 4.5% | 3.5% |
| Ivermectin | 13 | 4.2% | 4.6% |
| Ponazuril | 10 | 3.2% | 1.1% |
| Detomidine Hydrochloride | 9 | 2.9% | 5.6% |
| Firocoxib | 9 | 2.9% | 2.6% |
| Moxidectin + Praziquantel | 9 | 2.9% | 2% |
| Vitamin E | 6 | 1.9% | 0.8% |
| Sulfadiazine + Trimethoprim | 5 | 1.6% | 0.5% |
| Fenbendazole | 4 | 1.3% | 0.5% |
| Ketamine Hydrochloride | 4 | 1.3% | 3.3% |
| Penicillin G Procaine | 4 | 1.3% | 0.5% |
| Pyrantel Pamoate | 4 | 1.3% | 1.1% |
| Xylazine | 4 | 1.3% | 2.4% |
| Butorphanol Tartrate | 3 | 1% | 1.6% |
Ordered by report count. Differences from the species column often come from body size (which drugs a breed is prescribed) and from how common the breed was in the years a drug sold most. FDA states that these data cannot be used to estimate risk or to compare one product with another. Brand and manufacturer names are masked by FDA in these records.
Signs listed in reports
share of Tennessee Walking Horse reports listing the termall horse reports
- Death8.7%27
- Anorexia[not eating]8%25
- Ataxia[unsteady, uncoordinated movement]8%25
- Lack of efficacy - NOS[the product did not have the expected effect]7.1%22
- Colic6.4%20
- Depression[dull, quiet or withdrawn]6.4%20
- Recumbency[lying down and unable or unwilling to rise]6.4%20
- Abdominal pain6.1%19
- Death by euthanasia[the animal was euthanized]6.1%19
- Diarrhoea[diarrhea]6.1%19
- Lethargy[unusually tired or inactive]4.8%15
- Application site swelling[swelling where the product was applied]4.5%14
- Accidental exposure[exposure that was not intended]3.9%12
- Lip oedema3.9%12
- Behavioural disorder NOS[behaviour change, type not specified]3.5%11
- Weight loss3.5%11
- Ineffective, worms NOS[legacy FDA term: the product did not have the expected effect (worms nos)]3.2%10
- No sign[no clinical sign was reported]3.2%10
- Other abnormal test result NOS[abnormal laboratory result, type not specified]3.2%10
- Hyperhidrosis2.9%9
- Swollen mouth2.9%9
- Trembling2.9%9
- Collapse2.6%8
- Convulsion[seizure]2.6%8
- Fever2.6%8
Age and weight
Age of the animal
Weight of the animal
Coloured bar: Tennessee Walking Horse reports. Grey bar: all horse reports.
Trend and outcomes
Reports by month FDA received them. The newest months are incomplete because FDA posts reports with a delay of three to six months.
Outcome recorded in the report
Beside all horses
| Measure | Tennessee Walking Horse | All horses |
|---|---|---|
| Reports | 311 | 18,382 |
| Latest 12 months | 13 | 898 |
| Classed serious, of reports stating it | 48.7% | 44.1% |
| Death or euthanasia recorded, per 1,000 reports | 154.3 | 136 |
Questions about Tennessee Walking Horse reports
How many FDA adverse event reports involve Tennessee Walking Horses?
311 reports through March 2026, 1.7% of reports about horses; 13 in the latest 12 months.
Which drugs are named most often in Tennessee Walking Horse reports?
By active ingredient: ivermectin + praziquantel (55), moxidectin (35), pergolide mesylate (30), omeprazole (22) and pyrantel tartrate (18). Brands are masked in the public data.
What signs are reported most for this breed?
death (8.7%), anorexia (8%), ataxia (8%), lack of efficacy - NOS (7.1%) and colic (6.4%).
Is the Tennessee Walking Horse more sensitive to certain drugs?
Report counts cannot answer that. They show what was reported, not what a drug did, and they are not adjusted for how many Tennessee Walking Horse animals exist or were treated. Breed-related drug sensitivities that are established are described on FDA-approved labels; a veterinarian is the person to ask about an individual animal.
Why are crossbreds not included?
FDA records crossbred animals with one or more component breeds. Counting them under each component would double count, so breed pages use single-breed reports only. Crossbreds remain in the species totals.
How do I report a problem?
Call the drug company using the number on the label, or send Form FDA 1932a to FDA. See the guide on how to report.
Where this comes from. Counts are built from the openFDA Animal & Veterinary adverse event bulk files released 28 Sep 2026, which hold reports FDA's Center for Veterinary Medicine received through 31 Mar 2026. openFDA masks brand and manufacturer names in these files, so drugs are counted by the active ingredients each record discloses and no figure is attributed to a brand, application or company. Ingredient names, and the separate reference lists of approved products, follow the FDA Green Book as of 1 Oct 2026. Breed names are FDA's labels rearranged into everyday order ("Tennessee Walking Horse" becomes "Tennessee Walking Horse"). No report text, lot numbers or reporter details are published. See the methodology and sources; FDA's record is authoritative, and corrections are handled within five working days.