2. B Vitamins This group of vitamins is essential for energy production and brain function. B vitamins, including B1 (thiamine), B2 (riboflavin), B3 (niacin), B6 (pyridoxine), B12 (cobalamin), and folate, can be found in meat, eggs, and green leafy vegetables. Small dogs benefit from these vitamins as they help in carbohydrate metabolism and keep their energy levels balanced.