Are Russian olive tree thorns poisonous?

I noticed my dog was eating fruits from what turned out to be a Russian olive tree. I took some photos and sent them to an instructor who teaches toxicity at a veterinary school. She said they are not toxic (she also identified the tree for me). I also found a place online where it said that the fruits are not toxic to humans or animals (including livestock and the such), and I found that birds commonly eat the fruits (further suggesting they are edible). Overall, I'm not worried about my dog eating the fruits.