Excellent question and very understandable that you don't want a guess as to if these could be toxic to your dog.
According to the documentation I was able to locate on Goji berries (also called wolfberries), it is not adviseable to give them to dogs.
(If you go to this link - http://www.acreaturecomfort.com/toxic.htm and search under wolfberry, you will see it listed in the toxic list).
I also found other sites listing this as toxic, so I would definitely not risk giving it to a dog. I did view the Cornell Website looking for this, and it was not listed on their site, which is pretty well inclusive. As they state on the site - if it's NOT listed - assume it is toxic. So we will leave it at that. I could find NO documentation that listed the wolfberryor goji as non-toxic to dogs.
Please let me know if I can help further.
Hi! I heard back from Dr. Brown at Cornell today and below is his answer to my question. From what he says, these are not a problem for our canine friends and he is a specialist at the Cornell University Veterinary School in the toxicology area, so his opinion would be probably one of the best ones in the country! I hope this gives you the information you are wanting to confirm!
"These are like little tomatoes or peppers. Although it is in the nightshade family, the atropine levels are very low and since people eat them like raisins, i'm thinking the glycolkaloid levels are not very high either. The berry i worry most aboout with dogs is the common grape and the raisins we make from them. For some reason, although people can eat large amounts of these without harm, dogs have been poisoned and in some cases, killed by eating too many grapes or raisins.XXXXX XXXXX"