Fentanyl side effects in dogs
628 reports sent to the FDA between 1995 and 2026 involve Fentanyl in dogs. The most reported problems were loss of appetite, vomiting, lethargy. 45% were marked serious, and where it was recorded, signs eased after stopping the medicine in 100% of cases.
628Reports
45%Marked serious
20%Only medicine involved
46%Recovered
22%Died or euthanised
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About this medicine
Type: medicine.
Most reported side effects
Share = percentage of this medicine's reports that mention the problem. One report can list several problems.
Reports that it didn't work
Some reports are about the medicine not working (for example a dog still getting fleas or heartworm), not about a side effect.
How soon problems started
Time from the first dose to the first sign, where both dates were reported (527 reports).
How the animals did
Breeds named most often
Popular breeds appear more often because there are more of them.
- Labrador Retriever 68 reports
- Golden Retriever 19 reports
- Dachshund 16 reports
- Chihuahua 16 reports
- Siberian Husky 13 reports
- Boxer (german Boxer) 12 reports
- Pit Bull 12 reports
- Yorkshire Terrier 11 reports
- Bulldog 10 reports
- Beagle 10 reports
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