In many parts of the U.S., the edges and undergrowth of stands of trees, timber, forests and marshes contain poisonous vines. These plants are poisonous because of urushiol, a potent oily sap found all over the plants. While rare, dogs get poison ivy, poison oak or poison sumac through touch or ingestion. A dog's fur protects against the urushiol. But areas of a dog's body … [Read more...]