| Verdict for dogs | Don't feed |
| Severity | 2 / 5 — Mild — usually stomach upset; watch them. |
| Safe amount | None |
| Category | Fruit |
| Source | ASPCA Animal Poison Control — Toxic and Non-Toxic Plants database · reviewed 2026-08-07 · confidence: high |
The ASPCA lists grapefruit as toxic to dogs: essential oils and psoralens, causing vomiting, diarrhea and depression. Its own note is that the fruit is edible but the skin and plant material cause the problem — which, with the sourness and sugar, makes it a fruit to skip entirely.
Don't feed it. If your dog has already eaten some, call your vet or poison control with the amount and the timing and follow their advice.
Never induce vomiting and never give any medicine unless a vet tells you to — it can do more damage than the poison. What we will and won't tell you.
Can cats eat grapefruit? — Don't feed it to cats either.
No — grapefruit should not be given to dogs. If yours has already eaten some, call your vet. The ASPCA lists grapefruit as toxic to dogs: essential oils and psoralens, causing vomiting, diarrhea and depression. Its own note is that the fruit is edible but the skin and plant material cause the problem — which, with the sourness and sugar, makes it a fruit to skip entirely.
Watch for: Vomiting; Diarrhea or loose stools; Loss of appetite; Belly discomfort or unusual tiredness. Some signs lag by a day — call, don't wait.
The safe amount is none, as an occasional treat rather than a daily habit. Large amounts mainly cause stomach upset; if that doesn't settle within a day, call your vet.