Seems to me that it reveals piss poor dog training and dog handling more than it does a flaw in the dog. My weimaraners are always hard-charging instinctive hunting dogs and will chase anything that moves. They'll also stop when I tell them to stop, even if it means letting the cat go that she flushed while we were running a couple days ago when I hollered "whoa".
Sounds like those are good and well trained Weimaraners. Excellent breed.
OTOH, as some have said above, there are some individual dogs in any breed that are atypical, and some simply won't work out even with the best of training. Like some humans.
Not enough in the account to enable discernment, but readily killing chickens does not sound like a good foundation.
