Can dogs eat mayonnaise?

Caution — fatty, sometimes with problematic ingredients

Plain mayonnaise isn't toxic but it's almost pure fat, making it a pancreatitis risk. Some flavoured mayos contain garlic or mustard.

The full picture

Mayonnaise is essentially oil, egg, and vinegar — not poisonous, but nutritionally awful for dogs. The fat content makes it a pancreatitis trigger, and regular feeding contributes to obesity. Flavoured mayonnaises (aioli, garlic mayo, chipotle mayo, honey mustard) add garlic, spices, or sugar. If your dog licks a sandwich or salad with mayo, it's not an emergency, but don't share deliberately. Light mayo is still high-fat. Salad cream is similar.

Risks to watch for

  • Pancreatitis from fat content
  • Garlic in flavoured mayos
  • Raw egg risk in homemade
  • Weight gain

Safe portion size

Not recommended.

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Safer alternatives

  • Plain yoghurt (small amount)

Unexpected vet bills can run into thousands

One emergency visit for food poisoning can cost £500–£5,000+. Compare UK pet insurance in 60 seconds.

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Related foods

Cream cheese caution Peanut butter caution
Written and reviewed by
The Can My Dog Eat editorial team

Every food page is cross-checked against UK veterinary sources including the Veterinary Poisons Information Service (VPIS), the Animal PoisonLine, PDSA, and the Merck Veterinary Manual before publication. We do not accept paid placements from brands. If you spot an inaccuracy, please let us know — we take errors seriously and correct them quickly.

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Checked against UK veterinary guidance — see our editorial standards and source list. If your dog has eaten something and you need urgent advice, call a vet or the Animal PoisonLine on 01202 509000.

Important: This page is general information, not veterinary advice. Every dog is different, and individual factors (age, breed, health conditions, medications) can change what's safe. If in doubt, always contact your vet — or the Animal PoisonLine on 01202 509000 in the UK.