Caution. ASPCA lists common catbrier as a plant not toxic to dogs. Although ingesting it will not result in poisoning, watch out for GI problems like indigestion.
Risks
Although common catbrier is listed as a non-poisonous plant, it is best to exercise caution and keep dogs away from it. This plant is not suitable as food for dogs and eating too many of its leaves may cause common side effects such as vomiting and diarrhea.