My sister just bought a Rottie pup. He is CKC Registered has a two year guar 1st shots and three dewormings. On the two yr guar it states he is guar against CRIPPLING hip displacia! When should my sister get the pup x-rayed? What should she do to prevent this problem? Are guarantee's acceptable and do the breeders follow through? He is a cute little guy! I have to get pic's of the two of them