The AKC doesn’t address mayonnaise but has information on what dogs can and can’t eat The Spruce states : “Mayonnaise contains no ingredients that are toxic to dogs. It is an emulsion of oil and egg yolks with some added acidity like vinegar or lemon juice for flavor. Some recipes may also include mustard or other seasonings. None of these pose a risk of poisoning dogs. However, mayo has a high-fat content that can cause problems for dogs if eaten in excess.” By the way, the American Humane Society has a list entitled “Foods that can be poisonous to pets.”
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