Tamiya also makes a German shepherd in 1/35, which I think is included in their farm animal set, and I think it's also included in one of the German infantry sets.
I have one cast in white metal, solid, but I don't know who made it. I think I got it off eBay years ago.
Actually, I did a quick Google on "tamiya farm animal set" and found this eBay auction:
http://cgi.ebay.com.sg/TAMIYA-35128-1-35-MILITARY-FARM-ANIMAL-LIVESTOCK-SET-/260645262531
I am reminded now that apart from the Shepherd, there is also what looks like a puppy, or a smaller dog, lying down (just let him lie!
).
I recommend this set, anyway. All of the animals in it are useful to have in your stash for future use.
Try an eBay search, too. You can find a lot of hollowcast dog figures, like old Johillco or Taylor & Barrett, as well as other makers' figures, and solidcasts, that might fit your bill.
Hope that helps, prost!
Brad