8. Peas. Peas are probably one of the most nutrient rich veggies that you can serve your pup. They are full of vitamins A, B1, B2, B3, B6, C and K. They are also an excellent source of fiber, manganese, folate, protein, phosphorus, magnesium, iron, copper, zinc and potassium. Choose from snow peas, sugar snap peas or English peas.