One of the people I chat with on FB about dogs posted a warning about a type of mulch called Cocoa Mulch and apparently it can be very dangerous to pets.
Here's what snopes has to say about it:
http://www.snopes.com/critters...
May be a bit of a tempest in a tea pot, but since my own dog has a very bad habit of trying to eat the wrappers from chocolate candies that DH buys, I personally would be hesitant to use this particular type of mulch. FWIW.
