The weight/wingspan ratio is the only thing that really matters about your description. It is at the outer range of currently flying birds (black vulture: 3kg, 1.6m; red tailed hawk: 1.6kg, 1.4m), so i am not very hopeful about the flying abilities of your creature, especially since there is a lot of extraneous (i.e non-flying-related) anatomy that would need to be extremely lightweight to not detract much from the flying, and would also need to stow well. As you mostly described the look of the various features (i.e. 'thick neck' - but can it shake its prey to death?), it might be possible to have the head and neck and legs be mostly hairy air-sac that can effortlessly fold into aerodynamical shapes.
You featured a 'small' keel bone though, so i am going to predict this to only ever be a bad glider, not an aerobatics champion.
The decision about the hairy torso and legs is uncritical, as long as the hair is not detracting from the aerodynamics.
The tail has not enough area and is another nail in the coffin of aerobatics, but maybe your creature can fold its hind legs horizontally (like some dogs can while laying on the ground), and thus approximate a big steering area?
The attachment point of the wings does not need to matter that much, as we can prescribe the wings to be swept back or forward in flight to make the center of gravity match the center of lift.
I read nothing specific about the feet, but surmise that they are dog-like, which begs the question whether this can work as a bird-dog of prey: The thick neck is probably not bendable enough to bring the weight of prey in the yaws backwards, and the claws are not meant for holding prey, so... maybe it just feeds on the killing ground.
The wingshape is ok for a rather heavy area/weight ratio (not too elongated)
Resumé: This creature either has near-non-functional mammalian-looking features that are built (bones, muscles, teeth) extremely lightweight and thus do not work like their lookalikes, or it has an only somewhat brittle anatomy (still no way near a normal dog) but can at least fly like a bird of prey that has a uber-heavy load in its claws, i.e. awkwardly, and for short distances.
You might want to look into this being a normally-rugged dog, with wings that allow it some sort of swoop-attack from cliffs, without being able to gain height or even really glide.