I have a two year old German shepard.She is sweet,but gets into trouble. I had noticed she just all of a sudden started acting nervous around us,and she became scared and stubborn.She also was foaming at the mouth (Read those were all symptoms of RABIES). Something she does do is frog catch.And I know frogs make dogs foam.But,she started foaming this morning and hadn't been up to the pond?I haven't found any bite marks on her,so chances are it's something else,or maybe she is just sick in the stomach? I should also mention she wouldn't came in at night (That's when I notice something was up).Buts he is nervous anytime me and my grandma go to get here (we doctor on her together sometimes and she hates it.)But,if she isn't feeling trapped,she is happy,sweet dog.