✓ Reviewed against PDSA, Blue Cross & Animal PoisonLine guidance · Last reviewed: 2026-07
Can dogs eat grapefruit?
The full picture
Grapefruit sits in the same 'technically not acutely toxic but problematic' zone as other citrus. The flesh is extremely acidic and frequently causes vomiting, diarrhoea, and loss of appetite in dogs — even without the peel. The peel, pith, and seeds contain psoralens (photosensitising compounds) and citrus essential oils, which can cause more serious GI upset, skin irritation, and in large amounts, light sensitivity. The peel is also tough and can cause intestinal blockage in smaller dogs. Grapefruit juice, marmalade, and anything containing candied peel carry the same warnings. Safer citrus: none really — oranges and lemons share similar risks.
If your dog ate more than a safe amount
Grapefruit is toxic to dogs. The flesh, peel, and seeds all contain psoralen and essential oils that cause GI distress, photosensitivity, and depression. Call your vet or Animal PoisonLine on 01202 509000.
Risks to watch for
- GI upset from acidity (vomiting, diarrhoea)
- Peel and pith contain psoralens
- Essential oils irritate skin and digestion
- Peel is a choking/blockage risk
Safe portion size
None recommended. A single lick probably isn't an emergency, but there's no reason to share.
Safer alternatives
- Blueberries
- Apple slices (core removed)
- Strawberries
While you're checking what your dog can safely eat, make sure their flea and worm protection is up to date too.