Loss of appetite after Vitamin B12 in dogs

The FDA has received 139 reports of loss of appetite in dogs after Vitamin B12. That is 37% of all reports for this medicine, compared with 8.4% across reports for all dog medicines, so it is reported unusually often with this medicine.

139Reports
78%Marked serious
7.9%Recovered
36%Died or euthanised
4 daysTypical onset
SponsoredWorried about your pet? Ask a veterinarian online, 24/7

How soon it started

Same day
30 24%
1–2 days
28 23%
3–7 days
14 11%
1–4 weeks
24 20%
Over a month
27 22%

How the animals did

Recovered
9 6.5%
Recovered with lasting effects
2 1.4%
Still unwell when reported
62 45%
Died
25 18%
Euthanised
25 18%
Not known
16 12%

Problems reported at the same time

Age of the animals

Under 1 year
14
1–3 years
23
4–7 years
26
8–11 years
44
12+ years
30

About this medicine

Type: medicine.

Questions owners ask

Can Vitamin B12 cause loss of appetite in dogs?
139 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 4 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).

Loss of appetite with similar medicines

All reported side effects of Vitamin B12 in dogs · Medicines most reported with loss of appetite