Every dog is different. Individual allergies and sensitivities are common — always introduce new foods in small amounts and watch for adverse reactions. This site is for informational purposes only and is not veterinary advice. Always consult your vet.
The Full Picture
Lemons and other citrus fruits such as limes and grapefruit contain citric acid, limonene, and linalool, all of which can cause gastrointestinal upset in dogs. The peel, pith, and seeds are the most concentrated and most dangerous parts. Unlike oranges, whose flesh is safe in moderation, all parts of lemons are problematic. Symptoms of citrus ingestion include vomiting, diarrhea, and central nervous system depression in large amounts. Most dogs naturally dislike the strong sour taste, but lemon-flavoured foods, lemon essential oils, and lemon cleaning products should all be kept away from dogs.
What You Should Know
Lemons should be kept well away from dogs. If your dog has eaten lemons, watch for symptoms such as vomiting, diarrhea, lethargy, or loss of appetite. In an emergency, contact your veterinarian or an animal poison helpline straight away.