It's not something I've ever seen, but I certainly believe it given their incredible noses. And of course pigs are often used for truffle hunting. If you are gathering mushrooms to eat, it's not too hard to learn which are toxic anyway.
Once you know where patches are (at least for mycorrhizal fungi which are some of the best) it is easy to go back and get them each year. But, it still takes time to find all the locations and there is competition from other foragers, humans as well as other animals.
Once you know where patches are (at least for mycorrhizal fungi which are some of the best) it is easy to go back and get them each year. But, it still takes time to find all the locations and there is competition from other foragers, humans as well as other animals.