SHORT-COATED MOLOSSERS
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Accordingly to my experience, short-coated Molossian breeds of medium to large size have the best character endowments. Sheepherding breeds and Owtcharkas (long-coated Molossers) are less trustworthy and mentally unstable (if we consider their too dangerous reaction while attacking a human, the goal of which is often the throat, face or the head).
Because the largest Molossers are too much care- and food-demanding, I listed here only the medium to large sized ones. I believe it is suitable to choose as a companion and a defender such a breed in which the power of true Molossers is joined with the rapidness and movability of smaller breeds. To be such a breed that is not only strong but also rapid and that is neither too clumpy nor too food-demanding. Among such breeds we can find these: American Bulldog, Bandogge (Swinford and trublue, above all), Boerboel, Bull Mastiff (Bullmastiff), Cane Corso, Dogue de Bordeaux (French Mastiff, French Bulldog), Fila Brasileiro, English Mastweiler, Neapolitan Mastiff (Mastino Napoletano), Perro de Presa (Canario and Malorquin) and Rottweiler. I removed from the list Great Swiss Mountain Dog because it is not that sharp with strangers and Tosa Inu because although being an excellent fighter, it's defense abilities are not that good. And defense is the most important merit out of all.
American Bulldog (Tuff-N-Uff Kennel's http://hometown.aol.com/tufnufkennels/index.html)

Brazilian Bandogge for the first, then the Swinford Bandogge that is called “Pitbullmastiff” - a cross between APBT and Bull Mastiff (photos by Marcos Rondon http://www.negociorural.com.br/), then Bandogge Apollo and “Trublue Bandog” at the end (it is a American Staffordshire Terrier and Neapolitan Mastiff cross and it's photos came from Maria http://www.abcalert.com/):



Bull Mastiff - Bullmastiff
(photos by Mr. and Mrs. Hlinovi, ROTT-BULL the kennel http://www.stenata.cz/ROTT-BULL):


Boerboel also known as a Burish Bulldog, South African Mastiff or South African Boerboel (pictures came from Dave; this breed is both a top defender, good fighter, companion and short-coated Moloss, that is all-in-one lol):

Cane Corso:

Dogue de Bordeaux, also called French Mastiff or French Bulldog:
Fila Brasileiro (photos given by Miluse
Mikulasova):

English Mastweiler (a Rottweiler x English Mastiff cross, sources http://www.mastweiler.com/ and http://www.molosserdogs.com/):


Neapolitan Mastiff - Mastino Napoletano (the left one by Maria and the right one is Herkul by Zoran Miljic Silja):

Perro
de Presa (photos by Malgorzata Imosa-Nogiec):

Rottweiler
(RTWs from “Anaco” the kennel http://www.anaco.cz/):

Although the medium to large sized short-coated Molossers are ideal breeds, there are people who appreciate their splendid nature in a rather smaller style, especially when they live in a city's flat. Then American Staffordshire Terrier and Boxer - though already weaker short-coated Molossers - will be the suitable companions for such people.