Behaviour change after Lyme Vaccine in dogs

82 reports to the FDA describe behaviour change in dogs given Lyme Vaccine. That is 1.2% of all reports for this medicine, compared with 2.5% across reports for all dog medicines, so it is reported less often than average with this medicine.

82Reports
51%Marked serious
29%Recovered
15%Died or euthanised
3 daysTypical onset
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How soon it started

Same day
21 32%
1–2 days
11 17%
3–7 days
4 6.2%
1–4 weeks
8 12%
Over a month
21 32%

How the animals did

Recovered
22 27%
Recovered with lasting effects
2 2.4%
Still unwell when reported
26 32%
Died
4 4.9%
Euthanised
8 9.8%
Not known
20 24%

Problems reported at the same time

Age of the animals

Under 1 year
10
1–3 years
30
4–7 years
17
8–11 years
20
12+ years
5

About this medicine

Type: vaccine.

Mild, short-lived lethargy, soreness or a small lump at the injection site are the most commonly reported vaccine reactions.

Questions owners ask

Can Lyme Vaccine cause behaviour change in dogs?
82 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 3 days 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).

Behaviour change with similar medicines

All reported side effects of Lyme Vaccine in dogs · Medicines most reported with behaviour change