My neighbor is getting a labradoodle puppy. Lexie is almost 6. I didn't know at what age the pup should be before we introduce them? Lexie has played with small dogs but not that small. I think she would just stand there and let the pup jump all over her, but I want them both to have a good experience. What is the right way to introduce a pup? Thnx for all suggestions. We have a fenced in yard, they don't.