Can Dogs Have Oil? A Guide to Safe Oils for Your Dog

Can dogs have oil? It’s a question that comes up frequently among dog owners looking to boost their pet’s diet with something beyond standard kibble. The short answer is yes, certain oils can be genuinely beneficial for dogs, supporting everything from coat health to joint function. But not all oils are created equal, and some can be outright dangerous.

Fish Oil: The Gold Standard for Dogs

If there’s one oil that veterinarians consistently recommend for dogs, it’s fish oil. Rich in omega-3 fatty acids, specifically EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid), fish oil supports a wide range of health functions.

Benefits of fish oil for dogs:

• Reduces inflammation in joints, which may help dogs with arthritis
• Promotes a healthier, shinier coat and reduces excessive shedding
• Supports brain development in puppies and cognitive function in older dogs
• May help manage allergic skin conditions

Fish oil comes in liquid or capsule form. Liquid is generally easier to dose and can be drizzled directly onto food. Look for products specifically formulated for dogs, as human fish oil supplements sometimes contain additives that aren’t suitable for pets.

Dosage guideline: Veterinary sources typically suggest around 75-100mg of combined EPA and DHA per kilogram of body weight per day, but your vet can advise on the right amount for your dog’s specific needs.

Coconut Oil: Versatile Inside and Out

Coconut oil has become hugely popular in the dog world, and for good reason. It contains medium-chain triglycerides (MCTs), particularly lauric acid, which has natural antimicrobial properties.

Dietary benefits:

• May support digestive health and nutrient absorption
• Provides a quick energy source from MCTs
• Some owners report improved breath (though evidence is anecdotal)

Topical benefits:

• Moisturises dry, cracked paw pads
• Soothes minor skin irritation and hot spots
• Conditions the coat when applied as a rub or diluted in a spray

Use virgin, cold-pressed coconut oil for the best quality. Start with a small amount, a quarter teaspoon for small dogs, and increase gradually. Too much coconut oil at once can cause digestive upset or loose stools, as it’s calorie-dense.

One thing to keep in mind: coconut oil is high in saturated fat. For dogs prone to pancreatitis or those on a weight management plan, it may not be the best choice. Always check with your vet if your dog has any existing health conditions.

Olive Oil and Flaxseed Oil: Solid Alternatives

Two more that owners ask about often: avocado oil, where the oil and the fruit need separating, and sesame oil.

Olive oil is another safe option for dogs. Extra virgin olive oil is rich in monounsaturated fats, vitamin E, and polyphenols, antioxidants that may support overall health.

Olive oil can be particularly useful for:

• Dogs with constipation, a small amount can help lubricate the digestive tract
• Dry skin and dull coats, the vitamin E content supports skin health
• Older dogs, the anti-inflammatory properties may offer mild joint support

Flaxseed oil is a plant-based source of alpha-linolenic acid (ALA), an omega-3 fatty acid. While ALA is less efficiently converted to EPA and DHA compared to fish oil, it’s a useful alternative for dogs with fish allergies or sensitivities.

Flaxseed oil is best used as a supplement rather than a primary omega-3 source. It’s also more prone to going rancid than other oils, so store it in the fridge and check the use-by date regularly.

Oils You Should Avoid Giving Your Dog

Not every oil belongs in your dog’s bowl, or on their skin. Here are the ones to steer clear of:

• Tea tree oil: toxic to dogs even in small amounts; can cause tremors, weakness, and vomiting
• Pennyroyal oil: extremely toxic; can cause liver failure
• Citrus oils (lemon, orange, grapefruit): can irritate skin and cause gastrointestinal upset
• Peppermint oil: can cause respiratory distress, particularly in small dogs
• Pine oil: toxic if ingested; irritating to skin and mucous membranes
• Heavily processed cooking oils (e.g., refined sunflower, canola), not toxic, but nutritionally poor for dogs and excessively high in omega-6 fatty acids
• Walnut oil: while not directly toxic, walnuts can harbour mould that produces tremorgenic mycotoxins

The essential oil category deserves special attention. Many essential oils marketed for aromatherapy or household cleaning are genuinely dangerous to dogs. Even diffusing certain essential oils in your home can cause respiratory irritation if your dog can’t leave the room. When in doubt, keep essential oils well away from your dog. If your dog shows laboured or noisy breathing, tremors, weakness or collapse after any exposure, treat it as an emergency: contact your vet or your nearest Vets Now immediately. If you suspect your dog has swallowed an oil, call the Animal PoisonLine on 01202 509000.

How to Introduce Oils to Your Dog’s Diet

Adding oil to your dog’s food should be a gradual process. Here’s how to do it properly:

1. Choose your oil based on what you’re trying to achieve, fish oil for inflammation and coat health, coconut oil for general wellness, olive oil for digestive support
2. Start small: begin with about a quarter of the recommended dose for the first 3-4 days
3. Mix it into food: drizzle the oil over your dog’s regular meal and stir it in
4. Monitor for reactions: watch for loose stools, vomiting, reduced appetite, or skin changes
5. Increase gradually: if all goes well, work up to the full recommended dose over 7-10 days
6. Be consistent: oils work best as a regular supplement, not a one-off addition

Remember that oils are calorie-dense. If you’re adding oil to your dog’s diet, you may need to slightly reduce their food portion to avoid weight gain. This is particularly important for smaller breeds where even a teaspoon of oil represents a meaningful calorie addition.

Finding the Right Oil for Your Dog

The best oil for your dog depends on their individual needs. For most healthy dogs, a quality fish oil supplement is the most evidence-backed choice. Coconut oil makes an excellent topical remedy and occasional dietary addition. Olive oil and flaxseed oil are solid supporting options.

Whatever you choose, quality matters, opt for cold-pressed, unrefined products where possible, and store them correctly to prevent rancidity.

If your dog has specific health conditions like pancreatitis, obesity, or allergies, have a conversation with your vet before adding any oil to their diet. And if you’re curious about using oils topically, our guides on how to apply coconut oil to dogs’ ears and whether castor oil is safe for dogs cover the practical details.