Boxers have earned a slight reputation of being 'headstrong,' which can be related to inappropriate obedience training. Owing to their intelligence and working breed characteristics, training based on corrections often has limited usefulness. Those of her offspring sired by Flock St. Salvator and Wotan dominate all present-day pedigrees. Combined with Wotan and Mirzl children, they made the Boxer. . Their suspicion of strangers, alertness, agility, and strength make them formidable guard dogs. They sometimes appear at dog agility or dog obedience trials and flyball events. These strong and intelligent animals have also been used as service dogs, guide dogs for the blind, therapy dogs, police dogs in K9 units, and occasionally herding cattle or sheep. The versatility of Boxers was recognized early on by the military, which has used them as valuable messenger dogs, pack carriers, and attack and guard dogs in times of war.