According to the AKC standard for the breed, larger dogs are preferred by conformation judges. The coat typical for a scenthound is hard and composed of fur alone, with no admixture of hair. A common misconception is that Bloodhounds are employed in packs; while this is sometimes the case in Britain, where foxhound blood is mixed into them to increase speed, in North America, Bloodhounds are used as solitary trackers. When they are on a trail, they are usually silent and do not give voice as other scenthounds. The original use of the Bloodhound as a leash-hound, to find but not disturb animals, would require silent trailing.Nevertheless, the Bloodhound bay is among the most impressive of hound voices. Bloodhound Working Trials, first held in 1898, take place in Britain four times a year, under Kennel Club rules, organised by either the Association of Bloodhound Breeders, or The Bloodhound Club. They are run over farm land by permission of the landowners.