Bitter Orange

Yes, bitter orange (Citrus aurantium) is potentially toxic to cats. The plant contains compounds that can cause vomiting, diarrhea, lethargy, and photosensitivity reactions. This includes the fruit, peel, leaves, and especially the concentrated essential oils derived from the plant.

The most common signs are vomiting, diarrhea, and depression — the cat goes quiet, hides, or stops grooming. Drooling and pawing at the mouth from oral irritation are also typical. With heavier exposure or skin contact with bitter-orange essential oil, watch for tremors, weakness, and photosensitivity reactions (redness, dermatitis on lightly haired areas like the ears, nose, and belly) after sun exposure. GI signs typically begin within 2–6 hours; photosensitivity reactions can develop over 1–3 days with sunlight exposure.

Call your vet or the ASPCA Animal Poison Control Center at (888) 426-4435 right away if your cat is vomiting repeatedly, very lethargic, drooling, or unsteady. If essential oil got on your cat's skin, call before bathing — using the wrong solvent can drive the oil deeper into the skin. Do not attempt to treat at home without guidance.

Yes, the concentrated essential oil poses an additional risk beyond eating plant parts: topical exposure can cause skin irritation and is treated as a separate emergency from ingestion. The oil can penetrate skin on contact, so if your cat walked through spilled bitter-orange oil or was groomed with an oil-containing product, that is its own reason to call poison control immediately, even if your cat shows no signs yet.

Yes, Bitter Orange (Citrus aurantium) is potentially toxic to dogs. The plant contains essential oils and psoralens that can cause vomiting, diarrhea, drooling, and skin irritation — so keep dogs away from the fruit, peel, leaves, and any essential oils derived from it.

Most dogs show vomiting, diarrhea, drooling, and oral irritation within 2–6 hours of eating the peel or leaves. If sap or oil gets on the skin, watch for redness on lightly haired areas like the belly, groin, or muzzle; photosensitivity dermatitis can appear the following day after sun exposure. In cases involving concentrated oil ingestion, weakness or tremors are also possible.

A single small piece of peel rarely causes more than mild GI upset in a healthy adult dog, but call your vet right away if your dog vomits more than once, seems lethargic, or got essential oil on its skin or fur — call before attempting to bathe it. Small, very young, or already unwell dogs warrant a call even for minor ingestion. You can also reach the ASPCA Animal Poison Control Center at (888) 426-4435.

The hazard comes from essential oils and psoralens found throughout the plant, but the peel is particularly concentrated in these compounds. Psoralens are the chemical behind photosensitivity reactions: after skin contact with sap or oil, sun exposure within the next 24–72 hours can trigger dermatitis on lightly haired areas. The essential oils drive the GI symptoms — vomiting, diarrhea, and drooling — that typically appear within 2–6 hours of ingestion.