Is Vitamin A Toxic to Cats and Dogs?
Vitamin A (retinol) is moderately toxic to cats and dogs — chronic excess harms bones and joints, and cats are especially prone. Call a vet for guidance.
Can cause real harm — call a vet for guidance.
Can cause real harm — call a vet for guidance.
In an emergency, do not wait.
Medical disclaimer: This tool is for general information only and isnot a substitute for veterinary diagnosis or treatment. Toxicity depends on the amount, your pet’s size, and health history. If your pet may have ingested something harmful, contact your veterinarian or a poison control hotline ((888) 426-4435 / (855) 764-7661) immediately — do not wait for symptoms to appear.
What is Vitamin A?
Vitamin A (retinol) is moderately toxic to cats and dogs — chronic excess harms bones and joints, and cats are especially prone. Call a vet for guidance.
Also known as: retinol, retinyl, vitamin a supplement, cod liver oil, isotretinoin, accutane, tretinoin.
Symptoms to Watch For
🐕 In Dogs
- Vomiting and reduced appetite (acute large dose)
- Lethargy and constipation
- Joint stiffness and bone changes with chronic excess
- Neck pain or reluctance to move
🐈 In Cats
- Vomiting and reduced appetite
- Lethargy
- Stiffness and reluctance to move (cats are prone to bone and joint changes)
- Neck pain and deformed spine with chronic excess
What to Do If Ingested
- Note the form (retinol, cod liver oil, isotretinoin) and the amount in IU or mg, plus the number of pills.
- Call a veterinarian or poison hotline, especially for a large dose.
- Watch for vomiting or stiffness over the following days.
Steps apply to both cats and dogs. When in doubt, call a vet or poison hotline before acting.
When to Call the Vet Immediately
Call your veterinarian or a poison control hotline right away if you notice any of these:
- A large dose or chronic excess was ingested
- Persistent vomiting or lethargy
- Stiffness, neck pain, or reluctance to move
- Reduced appetite that persists
Frequently Asked Questions
Frequently Asked Questions
Can too much vitamin A hurt my pet?
Yes. Acute large doses cause vomiting, lethargy, and neck pain, while chronic excess — often from liver-heavy diets, cod liver oil, or retinoid supplements — causes bone and joint changes. Cats are especially prone to chronic vitamin A toxicity, which can stiffen and deform the spine. Call a vet if excess intake is suspected.
Is cod liver oil a risk for cats?
It can be. Cod liver oil is very high in both vitamins A and D, and cats fed it regularly can develop vitamin A toxicity with bone and joint changes (exostoses), plus vitamin D-driven kidney issues. Use supplements only under veterinary guidance and keep bottles out of reach.
Are acne medications like isotretinoin dangerous to pets?
Yes. Isotretinoin (Accutane) and other retinoids are vitamin A derivatives that are toxic in overdose, causing vomiting, lethargy, and bone and liver effects. Keep all retinoid capsules and tubes away from pets, and call a vet with the strength and number of pills if any are eaten.
Sources
This entry is reviewed against the following authoritative veterinary sources.
Last reviewed: 2026-07-11