Our expert says:
There is a chance that your GSD will only kill female pups and the male will be ok, but I personally wouldn't take that chance and I suggest that you either keep them apart until the pup is old enough to defend himself (at least 10 months old) or find another home for him. If you keep him separated he must still be integrated and socialised with other dogs of all breeds and ages so that he is used to dogs when he meets her. If you re-home him, but still want more dogs then I suggest you adopt fully grown young dogs rather than a puppies. Usually you would choose a dog that is the opposite sex (male in your case) and a working breed (GSD, Labrador, Ridgeback) rather than a terrier. The only other option is to wait until she dies before getting more pups.
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