Why is it dangerous for dogs to eat spinach?

It is not dangerous for dogs to consume spinach, but it should be provided in moderation. While it's a nutritious vegetable that contains vitamins, minerals, and fiber beneficial to dogs, it also has a high content of oxalic acid. This compound can bind with calcium in the digestive tract and prevent its proper absorption. If large quantities of spinach are ingested regularly, it could potentially lead to calcium deficiency. Additionally, some dogs may have an intolerance to spinach, showing signs of digestive discomfort such as vomiting or diarrhea.