one of my dogs looked more or less pure gsd hardly any running dog in him he caught more than some greyhoundy lurchers. three quarter collie quarter running dog will catch rabitts pheashant partridge foxes .if clever they could catch deer preban.you know it wont cut easy it should be very clever it wont lack stamina and should be good in the lamp.i have had threequarter reverse crosses and they can be a good mouching dogs.also they do not attract unwanted attention.if a threequarter gsd or collie came up i wouldnt turn it down .if it was proven to be a geniune cross