What's that smell?

Jozy has had a bath 2 days in a row now. She is getting into something outside that smells rancid. I spent 15-20 minutes today attempting to find out what it is. So far my best bet is some sort of wild mushroom that may be growing in our yard. Not sure though. Maybe she is hunting truffles. If I am right, we'll just have to hope they are not poisonous.