The dog is posting, which is like bracing the front legs in opposition to a leash being pulled. The front is straight, but probably not as much as we think because he is posting, and the picture isn't completely side-on. But his front legs don't seem to be underneath his body.
The rear is way underneath him. If he just had a flying leap or spring, then that would make sense, or if he jumped right after the picture. If not, then the rear is set wrong. If the handler moves his feet back to where they belong (hocks perpendicular), and the dog brings them back to this position, there is something wrong. Otherwise it's just a training issue, the rest of his rear looks fine. But from a single picture, you can't really tell.
I think the neck is fine, the hair is deceiving.