Presa=Dogo- same breed. Spanish line dogs will carry FCI papers that call them Dogo's in the rest of the world, although they can alsoe be registered with UKC. You cannot do it the other way around without specific approval. We know Ruth (Rocky Mountain) a bit- mostly through conversations online, never being able to meet in person yet. However, with that being said, we haven't actually "seen" Ruthie around in at least a year, so I'm not sure what they're even doing in the breed right now. Ruth has always seemed nice and well intentioned, and they do check their (few) dogs hips. As far as health problems in the breed..hip dysplasia/DJD (big problem), elbow dysplasia, luxating patellas, entropian, D. Mange, Seizures...to name a few things that have popped up in the breed. There are not exact numbers yet about how often any of these things occur int he breed, but the big one is Hip Dysplasia- so make sure you examine any contract carefully...