Other Dogs & Cats

Vitamin B12 (Cobalamin) for dogs and cats

Treats B12 deficiency from gut disease, pancreatic problems and some anemias. [1]

Last reviewed: October 2026 · 2 sources · see sources

Quick answerVitamin B12 (Cobalamin) (cyanocobalamin) is a prescription medicine for dogs and cats. It replaces vitamin B12 when the gut isn't absorbing enough. The most common side effects: well tolerated.

Key facts

Generic nameCyanocobalamin
Common brand namesVitamin B12
Used inDogs & Cats
TypeOther
Prescription?Prescription
Typical US priceNot listed (no reliable public source)

What it's used for

Treats B12 deficiency from gut disease, pancreatic problems and some anemias. [1]

How it works

It replaces vitamin B12 when the gut isn't absorbing enough. [1]

Side effects and cautions

Common side effects: Well tolerated. The shot may sting briefly. [1]

Use with care: Ask your vet how often your pet needs it. [1]

Call your vet right away if your pet has trouble breathing, facial swelling, hives, collapse, or any side effect that is severe or getting worse.

About dosingDosing is your vet's call. We don't list doses because the right amount depends on your pet's weight, age, health and other medicines. Don't change a dose or stop a medicine without asking your vet, and never give a pet medicine meant for people unless your vet tells you to [2].

What it costs

We don't list a price for this one because we couldn't find a reliable public source. Ask your vet or pharmacy for a quote; prices depend on your pet's size, the dose and where you fill it.

Vitamin B12 (Cobalamin) FAQ

What is Vitamin B12 (Cobalamin) used for in dogs and cats?

Treats B12 deficiency from gut disease, pancreatic problems and some anemias.

What are the side effects of Vitamin B12 (Cobalamin)?

Well tolerated. The shot may sting briefly.

Does Vitamin B12 (Cobalamin) need a prescription?

Yes. It needs a prescription from a veterinarian.

How much Vitamin B12 (Cobalamin) should I give my pet?

Only your veterinarian can tell you. The right dose depends on your pet's weight, health and other medicines, so we don't list doses. Never give a pet a medicine prescribed for a person or another animal without asking your vet.

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This page is general information for pet owners, not veterinary advice. Talk to your vet about your own pet.

Sources (2) — tap to show
  1. VCA Animal Hospitals – Cyanocobalamin (veterinary drug handout)
  2. FDA – Frequently asked questions about animal drugs