Sweet Orange

Yes, sweet orange (Citrus sinensis) is considered potentially toxic to cats. The essential oils in the peel, leaves, and plant parts can cause vomiting, diarrhea, lethargy, and skin irritation — even if the fruit flesh itself is less concentrated.

GI signs — vomiting, diarrhea, and drooling — can appear within 1–6 hours of chewing leaves or peel. Exposure to concentrated essential oils can also cause tremors, wobbly walking (ataxia), low body temperature, weakness, breathing difficulty, and skin redness where peel oils contacted fur. In severe cases, liver injury is possible and may appear later than the initial symptoms.

Bathe her promptly with a small amount of mild dish soap and lukewarm water, then rinse thoroughly to stop further absorption through the skin. Do not induce vomiting and do not give activated charcoal or other home remedies. Call ASPCA Animal Poison Control at (888) 426-4435 or Pet Poison Helpline at (855) 764-7661 for guidance, or call your vet immediately if she shows tremors, ataxia, or breathing changes.

GI signs from leaf or peel ingestion typically appear within 1–6 hours. With concentrated essential-oil exposure, onset is usually 6–12 hours but can be faster when absorbed through the skin. Most cats recover in 24–48 hours with supportive care, though potential liver effects can lag and persist longer — monitor your cat past the initial recovery window.

Sweet orange (Citrus sinensis) is classified as potentially toxic to dogs. The fruit pulp is mild, but the peel, leaves, and stems contain psoralens and essential oils that can cause vomiting, diarrhea, drooling, and skin irritation.

The most common signs are vomiting, diarrhea, drooling, and mild depression, typically appearing within 1–6 hours of ingestion and resolving within 12–24 hours. If peel oils contact your dog's skin or fur, watch for redness or itching—especially after sun exposure—due to the psoralens in the plant causing photosensitivity.

If your dog ate a small amount of fruit flesh, monitor for GI signs. For peel, leaf, or stem ingestion—especially in a small dog or a large quantity—call the ASPCA Animal Poison Control Center at (888) 426-4435. Seek immediate veterinary care if your dog was exposed to concentrated citrus essential oils.

The peel is the highest-risk part because it concentrates psoralens and essential oils; leaves and stems also contain these compounds. The fruit flesh itself poses the least risk, though large amounts can still cause GI upset. Exact dose thresholds are not well documented, so err on the side of caution with peel ingestion, particularly for small dogs.