Yes, truffles and mushrooms can have a pungent aroma that our four-legged friends are apt to sniff out. It’s been noted that some poisonous mushrooms have a fishy odor, making them attractive to some dogs. This is why it’s important to keep your dog leashed on hikes, especially in known wild mushroom territory. Yes, truffles and mushrooms can have a pungent aroma that our four-legged friends are apt to sniff out. It’s been noted that some poisonous mushrooms have a fishy odor, making them attractive to some dogs. This is why it’s important to keep your dog leashed on hikes, especially in known wild mushroom territory.