Bloody Lane Trail at Antietam National Battlefield is pet-friendly. The pathway is where the bloodiest battle of the civil war is said to have taken place. Bring your pooch along this haunted pathway and feel the presence of the young soldiers who lost their lives in this very spot. Leashed dogs are welcome on the trail, but are not allowed in the cemetery or inside buildings within the park. Antietam National Battlefield is open every day of the week from 9am to 5pm.