My dog goes outside and comes back in smelling like trash.

Basically, labradors are very active dogs, I don't have the same problem but my lab is very acive and running in and out of the house all the time. I think you can solve this problem by giving her a good daily exercise and something to keep her busy like toys and stuffs. Also scold her and punish him a bit everytime she does a=this mischief so she won't do it, also make sure that she has your attention while you are scolding her.