Are Oranges Poisonous to Dogs?

The toxic compounds in oranges:

• Essential oils (citrus oils, e.g. limonene and linalool concentrated in the peel and zest)
• Psoralens

If your dog ate oranges, watch for:

• •Vomiting
• •Diarrhea
• •Depression / lethargy
• •Potential dermatitis (skin irritation)

Are oranges toxic to dogs?

The ASPCA lists the orange plant (Citrus sinensis) as toxic to dogs, cats, and horses, with essential oils and psoralens as the toxic principles and signs including vomiting, diarrhea, depression, and potential dermatitis. However, the ASPCA also states 'fruit is edible; skins and plant material can cause problems.' In practice, the peeled, seedless flesh is safe in small amounts, while the peel, pith, seeds, and citrus oils are the parts that cause problems.

Can dogs eat orange peel?

No. Orange peel and pith are the hazardous parts. They are tough and hard to digest and can cause stomach upset or an intestinal blockage, particularly in small dogs, and they concentrate the citrus essential oils and psoralens that the ASPCA flags as toxic. Always remove all peel, pith, and seeds and feed only the inner flesh.

How much orange is safe for a dog?

Only a small amount of peeled, seedless flesh as an occasional treat — for most dogs a couple of small segments, kept within the ~10% of daily calories rule for treats. Oranges are high in sugar and citric acid, so larger amounts can cause diarrhea, gas, or stomach upset, and they should be limited or avoided in diabetic, overweight, or pancreatitis-prone dogs. Avoid orange juice, marmalade, candied citrus, and any sugar-free orange products (possible xylitol).

• ASPCA Toxic and Non-toxic Plants: Orange (Citrus sinensis)
• PetMD: Can Dogs Eat Oranges? Benefits, Risks, and Feeding Tips

Last updated 2026-06-25