I just met a Chihuahua today and the dog was growling and barking at me like crazy . I think you're wise to be concerned about puppy turning out the same way. I think people treat small dogs like a baby and carry is around every where and never let it get to act like a dog. You could bring him to a play group for puppies so he can learn puppies social skills . Dogs are very good at teaching other dogs how to act. You can ask as many questions as you want it won't cost any extra!