The only difference between international and national adoptions in regards to the adopting parents is that dominican couples may adopt even if they were not married but can prove that they have been living together as a couple for the same amount of time (5 years) and that single dominican adopting mothers may adopt ( only if they reside in the DR).
Also, couples willing to go ahead with an adoption process in the DR should be clear about the point that in the DR adopting parents do not get to directly choose which child they will adopt, instead CONANI ( National Council for Childhood and Adolescency), assigns them one depending on their application and background.
For more information on the process please see:
http://www.drlawyer.com/txt/articlesadop.html
Alfredo Guzman