Vocalising after Fenbendazole in dogs

The FDA has received 194 reports of vocalising in dogs after Fenbendazole. That is 3.3% of all reports for this medicine, compared with 1.2% across reports for all dog medicines, so it is reported unusually often with this medicine.

194Reports
28%Marked serious
27%Recovered
8.8%Died or euthanised
Same dayTypical onset
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How soon it started

Same day
55 55%
1–2 days
19 19%
3–7 days
4 4.0%
1–4 weeks
10 10%
Over a month
12 12%

How the animals did

Recovered
53 27%
Still unwell when reported
37 19%
Died
15 7.7%
Euthanised
2 1.0%
Not known
87 45%

Problems reported at the same time

Lethargy
49 25%
Restlessness or agitation
42 22%
Vomiting
40 21%
Loss of appetite
36 19%
Behaviour change
35 18%
Tremors
23 12%
Diarrhea
19 9.8%
Death
17 8.8%

Age of the animals

Under 1 year
121
1–3 years
33
4–7 years
19
8–11 years
7
12+ years
9

About this medicine

Fenbendazole treats intestinal worms and some other parasites.

Questions owners ask

Can Fenbendazole cause vocalising in dogs?
194 reports link the two, but a report alone does not prove the medicine was the cause: other illnesses, other medicines or coincidence can be involved. Your vet can judge it for your animal.
How soon after a dose was it reported?
In half of the reports with dates, it started within the same day of the first dose.
What should I do?
Don't give another dose until you've spoken to your vet, and keep the packaging so you can tell them the product and dose. Your vet can also report it to the FDA (or you can, through the manufacturer or FDA form 1932a).

Vocalising with similar medicines

All reported side effects of Fenbendazole in dogs · Medicines most reported with vocalising