The Mastiff is a large, massive, symmetrical dog with a well-knit frame. The impression is one of grandeur and dignity.
Dogs are more massive throughout.
Bitches should not be faulted for being somewhat smaller in all dimensions while maintaining a proportionally powerful structure. A good evaluation considers positive qualities of type and soundness with equal weight. The farther below standard, the greater the fault. The height of the dog should come from depth of body rather than from length of leg. Great depth and breadth desirable.