Does my dog feel left out?

I just got a new puppy a golden retriever i have another golden retriever thats older and she loves the new one to death but i also have a chihuahua right when i brought the new puppy home the olden golden started playing with her and stopped playing with my chihuhua ever sense then my chihuahua hasnt played with anyone his head is always down with his eyes up. Should i get another chihuahua Or small dog his size so they can all play together?? i give all my dogs attention but my chihuahua just looks so depressed.