They are aggressive in the sense that they will want to finish trails, and that they can be hard to call off once on a track. They can be difficult to train off-leash for this reason. However, they are not generally aggressive toward other dogs or people. The pendulous skin over their ears and eyes will fall down over their eyes when they lower their head to trail, effectively blinding them. Because of this and their determination, Bloodhounds are usually run on leash for their own safety.
Bloodhounds can make an amazing variety of sounds.
They can bay expressively, howl and whine, all in melodious tones. The neighbors may not appreciate this, however. Hip Dysplasia Bloodhounds may have hip dysplasia, a potentially crippling disease. Bloat Bloodhounds, because of their physical shape, are extremly prone to Gastric Torsion or Bloat as it is more commonly called. Be sure that you discuss Bloat with your veterinarian, especially on what the physical symptoms are and where you can obtain emergency veterinary care after hours.