Beware some pics are gruesome. 

Beware of Boz Sheperd: http://www.texasworkingdogs.com/boz_shepherd_dog.htm  

Although some of the dogs that are shown are not even Boz Shepherds.

More: http://molosserdogs.com/forum/#topic/Strange-Unexpected-Behavior.htm 

My mother talked to a farmer and said they where not good LGD because they where to aggressive, many health problems and would leave the flock like the blog above describes. Also he said that he had to go through like 4 dogs because of aggressive and health problems.