What is he doing???

[2dogmom]

Ok, so gus has been doing this really strange thing lately, and I need some help to figure out what it is. When i take him out to go pitty he does his business but every noe and then he will find a scent and do this thing with his mouth then when he looks up at me he has this white foamy stuff all over his mouth. Its disgusting and I try and watch him to stop it before it happens. Im sure its totally normal but  I've never seen it before and it's bothering me. Any ideas??

[lins_saving_grace]

Phleming.

so it's typically a male behavior? 

[2dogmom]

Thanks for all the advice! I figured it was normal, it's just so gross!!! It's like he's foaming at the mouth over some other dogs pee! YUCK! Oh, how do I post his picture when i do a post? He has a pw print I just figured it would do it automatically but it doesnt.