[Judith Anne]

Nope. American Mastiffs are like English Mastiffs, but bred to have a dry mouth, are very dignified, very gentle, house dogs and service dogs.

[Mr. Mojo]

'American Mastiffs' are not an AKC registered breed, and I doubt they even have UKC registry. What is the origin of the breed, and how long have they been around?

[Mr. Mojo]

I just Googled them and it appears they ARE a newfangled breed .....brand new, in fact. And in the FAQ section it says they a Rottweiler/Bullmastiff/Pit Bull mix.