Adult bloodhounds are a large/extra large breed. The bloodhound breed standard gives the heights at 25”-27” for males, and 23”-25” for females. However it is very common to have males and females taller than those heights. The breed standard gives the weights at 80-110lbs, but there will be proportionally greater weights in a taller dog i.e. there are bloodhounds in the 120lb to 130+lb range, so as a rule of thumb be prepared for a 100+lb dog at least.