Many Molossers, including Mastiffs, have difficulty maintaining pregnancy. Low progesterone may be the culprit.
What is true Tibetan Mastiff type? Richard Eichhorn returns to the history books for some clues.
Here's a concept: Working dogs that actually can work! Read all about the the basics for drafting, or cart work.
Adele Pfenninger was once known for her winning Bullmastiffs. Now her paintings depicting them are sought after by art-minded fanciers.

When it comes to breed type, more is not always more.
Bullmastiff judge and expert Billy Brittle shares his concern about overdone dogs — and the departure from breed type that they represent.
Tibetan Mastiff breeder and judge Richard Eichhorn shares his introduction to the breed, and his strong opinions about how it should be classified.
An authoritative piece on Bullmastiff type by breeder-judge Helene Nietsch.
They say Mastiffs are like Fritos: You can’t have just one. Here's how to manage a crop of them.
What you need to know before your Molosser undergoes anesthesia.
Crafting the American standard for the Dogue de Bordeaux took time, patience ... and lots of overseas input.