As big as the Bull-Mastif. Mix breeds vary in size due to the chromosome mix. I believe a male of this mix won't get bigger than waist high (I'm 5'2") at the withers (the dogs front shoulders).
If the mother is the Old English Mastiff then the puppies would be bigger than if the American Bulldog was the mother.
If the English Mastiff was the mother then I would say that they could be...
No, they are not the same. the American bulldog, like the English and french bulldog, is from the bulldog family. the American pittbull terrier is from the terrier family like the jack Russel.
According to the breed standard, American Bulldogs should weigh between 60-120 lbs. This is a large varience compared to most other breeds. The type of AmBulldog, standard/Scott vs Johnson, can...