I'm just wondering, but do people prefer to see OFA certifications or PennHip certifications on the breeding dogs? I recently read an article that gave specifics as to why PennHip is better and the procedure they use gives you a much better and thorough idea as to the actual laxity of the dog's hips. Are there a lot of breeders that do PennHip? Or is OFA the general most accepted hip certification method? Would you still buy from a breeder that did PennHip certs instead of OFA certs?