I think that if he has a roached back now he will probably still have it when he gets older. Perhaps if you posted a picture of him, we could see if he has a roach back. You really shoulden't buy a male or female for breeding until they are atleast 6 months old, this will give you a good idea of how they are turning out. If you get them before then, you are taking a chance on them being able to be bred.
Yes the breeder should always make the buyer aware of any and all health problems and/or defects. But there are alot of breeders out there that will either lie or not tell you.
My Scampers can look like he has a roach back at times. Usually only when I try to get him to stand for me. He hates it and will hunch his back because he really wants to lay down. But when he is alert or in natural posture, his topline is very good. I don't know what he has against standing for me but he hates it and tries to either sit or lay down everytime I try. I am still working on getting him to stand for me, but it is not an easy process, he is sooo stubborn and has a If I don't want to do it, I am not going to attitude.
