Can dogs eat mayonnaise?
✓ Reviewed against PDSA, Blue Cross & Animal PoisonLine guidance · Last updated: 2026-06-17
How we keep this site free. Some links on this page take you to Amazon or other online retailers (including vet pharmacy partners Best Vet Care and Canada Pet Care via CJ Affiliate). As an Amazon Associate and CJ publisher we may earn a commission at no extra cost to you. Full disclosure.
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.
For a detailed calorie breakdown, see 247CalorieCheck.
If your dog ate more than a safe amount
For a small accidental taste, watch for vomiting, diarrhoea, or signs of discomfort over the next few hours. For a large amount or if your dog is small or has existing health conditions, call your vet. When in doubt, call the ASPCA Animal Poison Control Center on (888) 426-4435.
Risks to watch for
- Pancreatitis from fat content
- Garlic in flavoured mayos
- Raw egg risk in homemade
- Weight gain
Safe portion size
Not recommended.
Safer alternatives
- Plain yogurt (small amount)
Does size or breed matter?
Risk with mayonnaise scales with the quantity relative to body weight, so small and toy breeds reach a meaningful dose from a much smaller amount than large dogs. Always check for hidden risk ingredients (garlic, onion, xylitol, excess salt) in any prepared or shop-bought version rather than assuming the plain ingredient name on the label tells the whole story.