A nationwide recall has been issued for dog and horse medication after glass fibers were found floating in injection vials. American Regent Inc. announced that select lots of Adequan Canine Injection and Adequan i.m. Injection joint medication are affected by the recall. The recall includes two lots of Adequan Canine Injection, which is used to treat joint dysfunction in dogs, and two lots of Adequan i.m. The company said the glass fibers were found during routine testing.