Unless you are in the Dalai Lama’s gift list, you will have to look for this Tibetan jewel on your own. The Tibetan Mastiff is an impressive, formidable guardian, which is territorial and protective by nature. 
Potent, heavy, with a good bone structure, the Tibetan Mastiff has a solemn and impressive aspect. It is a breed with a very good quality coat, quite long hair (quality matters more than quantity), with a thick undercoat. The head is wide and heavy; the skull is sturdy; the muzzle is quite wide; the eyes very expressive, medium sized and brown; the ears are also medium and triangular, dropping carried low, they seem to rise when the dog is attentive. The neck is strong, muscular and arched without too much dewlap; the hair collar around the neck stands. The neck is straight and strong; the shoulders well sloped, strong boned; the forelegs, muscular and good boned, are straight, with strong metacarpus and slightly sloping; the hinds are well angled. Seen from behind, they are parallel; removing the dewclaws, simple or double, is optional. The deep chest reaching the elbow. The tail is medium length, without passing the tip of the hock, curled over the back and provided with stripes. The Tibetan Mastiff’s color can be intense black, black and tan, brown, golden or gray; a white spot is admitted, and a minimum of black over the feet. The male is 66 cm tall; the female 5 cm less.
Perhaps the most attractive color in the Tibetan Mastiff is the black and tan; could it be a long haired Rottweiler? 
A quite large dog, the Tibetan Mastiff is a very protective animal, reserved with strangers but not unpleasant. It is a fantastic companion, but not for everybody, since the teddy bear puppy turns into a considerably large dog. It needs a fenced and well closed yard so it doesn’t wander and knows its territory. Too large for small children to mishandle it, it is patient and gentle with them, but much more with children from its own home, so don’t allow strangers or your children to approach the dog before introducing them. It is an adaptable, independent dog that needs stimulation and due socialization. It is a night barker and its voice is very deep, as a good guardian it should be.
The Tibetan Mastiff grows slowly and the female reaches maturity at three or four years; the male not before four to six years. The puppy’s size varies considerably, many times larger than desired. After 12 or 13 weeks, it weighs about 20 kg. The puppy’s socialization is vital to form an obedient and manageable adult. The breed can be aggressive and stubborn. The adolescent can be a delicate eater.
Your Tibetan Mastiff only needs to exercise moderately and receive a good protein diet that doesn’t over stimulate growth, without giving it supplements. This combination will help avoid possible growth problems and anomalies to which most large breeds are prone. 
Usually a healthy breed, the Tibetan Mastiff should be proven free of dysplasia. The Tibetan Mastiff is not a real giant; it can live more than ten years. It is prone to thyroid deficiencies, as well as congenital neuropathy myelin, a genetic nervous anomaly that affects puppies under 12 weeks, and which makes said puppies not able to stand on their feet. The Tibetan Mastiff is notably adaptable to weather, perhaps because its ancestors resisted the extreme temperatures in their native Tibet. It can live outside due to this fact, but prefers to be inside with the family.
The teddy bear appearance charms the children. However, this trio of teddy bears will grow quickly and will be large in size, which will continue to be gentle with children they meet.