Donna, I just went to Tootie's Dogster page, and I looked hard at the last picture. It's hard to tell if he is a bit humped, or maybe it's the way his fur grows at the top of his back. Or it could just be because he is standing on an uneven surface. If you could try to get pictures from the side standing on a level surface, it would help to see his top line.
Either way, I don't think a roach back is a medical problem. It just won't get him any ribbons in dog shows.
If he's your pet, you will love him just the same. Wosie's front legs are shorter than her back legs, and she has an overbite so her tongue hangs out. She's my cutie patootie anyhow! She is also spayed and I would never have bred her anyway.
Standard faults do not matter when you love your pup as much as we do!!