The Westie-Poo is not a purebred dog.  It is a cross between a West Highland Terrier and Poodle .  The best way to determine the temperament of a mixed breed is to look up all breeds in the cross and understand that you can get any combination of the characteristics found in either breed. This designer breed is recognized by ACHC (American Canine Hybrid Club) and named Wee-Poo.