Bad Ass Dog #4 Derek should get Caucasian Shepherd Dog

Caucasian Shepherd Dogs are strongly-boned, muscular and even-tempered Molossers. The breed has two types: mountain and plain. Plain dogs have a shorter coat and appear taller as they are more lightly built. Mountain dog types have a heavier coat and are more muscularly built. The breed's weight range is 46–82 kg (102–180 pounds), although individuals over 100 kg (220 pounds) are not uncommon, and the height range is 74–88 cm (28-35 inches)

Softness and vicious temperaments are considered serious faults for the breed. Generally healthy and long lived, hip dysplasia, obesity and occasional heart problems are known to occur. The ears of the Caucasian Shepherd are traditionally cropped, although some modern dogs are unaltered. The preferred show-types are the long-coated grey dogs with some white markings. Black or black-and-tan dogs are often not acceptable in the show ring. The minimum height is 24.5 inches with no upper limit.

[edit] Temperament
Caucasian Shepherds are typically assertive, brave, alert, strong, hardy and courageous to a fault. They are probably the most aggressive natural guard dog bred in domesticity and truly second to none in bellicosity towards strangers. Unless properly socialised, they may exhibit ferocious and unmanageable tendencies. They seldom have time for strangers (but will greet family friends warmly) and have powerful guarding instincts. Everything and everyone who belongs to the family, including children, cats, other dogs, etc. will be regarded by this dog as part of its family and as such will fall under its guardianship. Owing to their size and nature these dogs should not be left alone with children. Aggression and dominance toward unknown dogs should be expected unless the animal has been extensively socialised at a young age and even then some unwanted behaviours may occur. This dog breed requires an owner who knows how to display strong, calm and balanced leadership and one who is willing to spend a lot of time ensuring the development of a well-balanced animal.