Peas are a great source of Vitamin K, and C. They are a good source of manganese, fiber, folate, phosphorus, protein, magnesium, copper, iron, zinc, potassium and vitamins B1, A, B6, B3 and B2. They contain higher levels of protein than grains and they are a good source for most essential amino acids. This makes peas an ideal protein especially in conjunction with the protein in meats and meat meals. Peas are a good source of fiber, which helps with bowel issues. Phytonutrients in green peas also provide dogs with key antioxidant and anti-inflammatory benefits. Recent research has shown that green peas are a reliable source of omega-3 fats.