That is just toooo funny!! I can just see them!
Tell Mr. Romeo that I once had a spoiled little "peek-a-poo" and I bought my son a Collie puppy who was smaller than Brandi [the poo]. Brandi would do the same thing to Duchess [the collie] ... then suddenly, like overnight, Duchess was bigger than Brandi who suddenly had to run for cover!! Little Dinero will be big enough to hold his own before you know it and boy will Romeo be surprised!!!
I'll bet they will have a great time and be best friends!!