Every dog is different. Individual allergies and sensitivities are common — always introduce new foods in small amounts and watch for adverse reactions. This site is for informational purposes only and is not veterinary advice. Always consult your vet.
The Full Picture
Spinach is not toxic to dogs and contains iron, vitamins A, B, C, and K, and antioxidants. Like kale, however, spinach is high in oxalic acid (oxalates), which can interfere with calcium absorption and, in large quantities, can contribute to kidney damage. This is mainly a concern with very large amounts or for dogs with existing kidney issues. Small portions of cooked, plain spinach as an occasional supplement to their regular diet is fine for healthy dogs. For a safer everyday leafy green, lettuce has far fewer oxalates.
What You Should Know
While spinach is not outright toxic, there are important precautions to bear in mind before sharing it with your dog. Portion size matters, and certain preparations or varieties may be unsafe. If your dog has any existing health conditions, check with your vet first.