I had a co-own on a dog that was the offspring of Figo von der Wilden Nachtbarschaft
Figo von der Wilden Nachbarschaft and Olympic's Lola
Olympics von Lola
She was dog-aggressive, especially with females, and after she had pups, she went a little crazy. She would NOT stop pacing, and would even spin in her kennel. She wore a track in the fenceline of the 4,000 sq. ft. field she was turned out in. She was eating an insane amount of food every day, and was still rail-thin, even though she was parasite-free. I can't recall what other tests were done to try to get to the bottom of the problem, but I do know nothing was found.
The main owner did do some schutzhund with her, and she had an extremely hard bite, and didn't like to out. Unfortunately, the same was true when she latched onto the owner's other very pregnant bitch, when someone didn't close a gate properly. She found a new home for her after that.
Any insights into what might have gone wrong, either with the breeding or other factors (hormones, environment, etc.)?