Buyer beware. Please, please if you are looking at the Estrela breed, do not only do breed homework but Breeder homework. NOT ALL breeders are created equal. Not all breeders test, not all breeders take back rehomes, not all breeders warranty, not all breeders follow SIMPLE ethics such as breeding underage dogs and health testing.
Here is a third party link if you are unsure what to look for: dogplay.com/Breeding/ethics.html