The affectionate Lhasa Apso weighs between 12 and 18 pounds fully grown, making it a popular apartment dog. Originally, these mountain dogs worked as watchdogs in the palaces and religious centres of Tibet. Characterized by very long fur from its snout to its tail, the Lhasa Apso needs careful daily grooming to keep that coat from tangling. These dogs are loyal and devoted family dogs that easily fit into most households, large or small.