I'm only getting an answering machine <a href=" http://vfg.se/cytotec-dosage-for-4-weeks-pregnant.pdf ">buy cytotec tablets online</a> But a few indigenous breeds in North America have a purer pedigree — at least one has genetic roots in the continent that stretch back 1,000 years or more, according to a new study. These modern North American breeds — including that current urban darling, the Chihuahua — descended from the continent's original canine inhabitants and have not mixed much with European breeds.