There's a group that rescues the "satos" of Puerto Rico and arranges to have those little homeless mutts brought to US shelters for adoption. Their organization's website is at www.saveasato.org (some of the info on it is terribly heartbreaking). If you click on "How to Help" and then on the next page on "Stateside Shelters/Adoptions," you'll find a shelter in Dundee, Illinois that assists the satos. These dogs are usually small, almost always mixed breeds, and have all their initial vet issues taken care of by the time of adoption. Maybe worth a look?