Is this shelter dog a GSD?

Looks like a coated, possibly bi-color GSD.  Kenya greyed like that at 3 years so 6 years makes sense.  Looks like the bone is heavier and there appears to be more rear angulation so based on that pic I would agree, more GSD than Belgian, could be a mix though.  A guy in my neighborhood insisted I should breed my (spayed) GSD to his over-sized Belgian shepherd so you never know!

I have never seen a German Shepherd like this before, but it should not be outruled that it is, sorry to see that this dog is almost on it's hocks. Sorry breeding. How sad!

It is not a belgian.  That is quite fine a head for a gsd but that does occur in random breedings with no consideration of type.  The body style is clearly gsd (rectangle) not  belgian (square).

 Is it just my computer or does that coat look liver rather than black?

I his coat is liver and black, it is not just your computer. I think he is a GSD and a Belgian mix. There are a couple types of belgian dogs, you can look at the pics. He does have that triangle body like a GSD but his coat looks like a mix of something else.

http://www.dogbreedinfo.com/belgiangroenendael.htm

http://www.dogbreedinfo.com/belgiantervueren.htm

http://www.dogbreedinfo.com/belgianmalinois.htm

There is a possiblity it is a belgian X GSD.  However, there is far more gsd than belgian in that dog.  One of the problems with single shots, you have any number of characteristics of type which can not be evaluated.  For those interested, here is a link to malinois rescue that helps point out the major differences.  The coat is common of the more heavily coated gsds.

http://www.malinoisrescue.org/abmcidmal.shtml

There are four varieties of belgian shepherds all named for the geographic region or town in which the type was developed.  They are essentially the same dogs with different coverings.  There are variations from the original dogs in temperment but that is more a function of breeder selection.  It is possible to get dogs of two different coats in the same litter.  Every where but the US, belgians are registered as the fall.  In AKC a black dog of two parent tervurens is a dog with a disqualifying coat.  In all other conformation type events, the animal is listed by its variety.  You can also get long coated dogs or wire coated dogs out of malinois breedings.  There were more color variations initially but those colors fell out of favor and removed from the breed standard.  There is a black and tan  Laeken on the club website.  http://www.belgianlaekenoisclub.us/

Malinois short coated, fawn to mahogany, with black overlay (which is expected to darken with age)   http://malinoisclub.com/

Laekenois wire coated dog

Tervuren long coated, fawn to mahogany, with black overlay  http://www.abtc.org/

Groenendeal long coated black dog  http://www.bsca.info/

UKC club  United Belgian Shepherd Club of America One breed, four varieties  http://www.ubsda.com/

hsas2005

I his coat is liver and black, it is not just your computer. I think he is a GSD and a Belgian mix. There are a couple types of belgian dogs, you can look at the pics. He does have that triangle body like a GSD but his coat looks like a mix of something else.

  The coat actually looks typical of coated GSDs. I see no Belgian in this dog at all and it is quite common for coats to be mis-IDed by shelters as Belgians. This is a purebred GSD and IMO most likely from American show lines. That sort of rear angulation does not randomly occur in GSDs and disappears within a generation or so if people aren't actively selecting for it. If the dog was a mic with a Belgian, it is very unlikely she would have that sort of angulation. The more refined head is also not uncommon in Amline GSDs. The markings are also typical of GSDs but not typical of Belgians.

 http://www.vonhaydengermanshepherds.com/longhaired.html

http://www.4gsd.net/colours.html

http://www.geocities.com/Petsburgh/2788/lhgsd.htm

http://www.shawlein.com/The_Standard/13_Breed_Type/Breed_Types.html

 http://www.shawlein.com/The_Standard/13_Breed_Type/Breed_Types.html

hsas2005

He does have that triangle body like a GSD but his coat looks like a mix of something else.

It looks like a coated GSD, maybe American lines judging by the shape of the face and angulation in the rear (at least what little can be seen from the angle of the shot).  Could be a mix I guess but I don't think there's anything in the pic indicating the dog cannot be a pure GSD.

It seems if the dog was a Belgian GSD mix it would have less angulation, not more.  This dog appears to be more angulated than both of my purebred GSDs.  We have a GSD/Mal mix at our club (accidental tie between purebred GSD and purebred Mal) and he looks just like a GSD except his body is slightly more square and his rear is slightly less angled.

Liesje

 Is it just my computer or does that coat look liver rather than black?

Not sure when the picture was taken, but I'm wondering if his coat is bleached from the sun?  It's not uncommon for black dogs (or other critters) to get a reddish tint to their coats in the summer/summer climates.  That said, like Liesje said, he looks like a coated GSD to me.

edited to correct typos.

 I'm guessing coated American GSD, too, and not Belgian. 

Yeah, that's not liver coloring, the black is sunbleached. I've seen it a lot in black colored outdoor dogs; part of the fur turns a reddish brown color.

This dog will end up with severe joint issues if they aren't already present.

Also, many dogs that are kept outside year around will develop a much heavier coat than dogs having access to inside environment.

 I see purebred longcoat GSD.  Looks Ambred actually....crappy coat.  Sunburned and currently blowing out dead coat.  Pretty girl overall though