First congratulations! and I think its wonderful you adopted this guy. Thats pretty cool he ended up being 100% boxer. Just keep his results with you if anything ever comes up. I think he would likely need to be proved not to be a boxer, or show aggressive tendencies. But after all these years on this board I think you are one of the responsible ones who keeps their dogs under control and not running off lead. I would probably share the DNA info with he vet, maybe make them a copy to look at. I hope all goes well with his treatments.