There are those dogs that appear on «The Dog Whisperer» — allowed to get away with bad behavior, and many stories of individuals in the breed launching attacks on dogs much larger than them. (professorshouse.com)
[Eric R. Schuppe, Gloria D. Sanin and Matthew J. Fuxjager, The social context of a territorial dispute differentially influences the way individuals in breeding pairs coordinate their aggressive tactics, in Behavioral Ecology and Sociobiology] (scientificamerican.com)
Coat loss issues can happen, hypothyroidism, Cushing's disease, entropian, Perthes disease and fungus infections can affect individuals in the breed. (professorshouse.com)