articleThe Brief Select lots of Adequan dog and horse medications have been recalled nationwide. Glass fibers were discovered in injection vials during routine testing. A nationwide recall has been announced for certain dog and horse medications after glass fibers were discovered floating inside injection vials. Injection, medications used to treat joint-related conditions in dogs and horses. RELATED: More than 1,000 climbing ropes recalled over potentially deadly fall hazardAccording to the company, the glass fibers were detected during routine testing.