I'm renting a house with a nice backyard and lots of trees, shrubs, etc. I'm a little concerned because my dogs love to dig and eat random stuff they find. This plant here is there most recent favorite. They dig at it and pull little small potato grape looking bulbs that they like to chew. I try and stop them, but I wanna make sure it's not poisonous. Anyone have any idea what this is? It's located in Southern California.