The Daniff is a hybrid between the Great Dane and the Mastiff. Country of Origin: Daniffs originate in the United States of America. Original Purpose: The Daniff is a great family companion. Breed Characteristics: Daniffs generally are intelligant, protective and very curious dogs. Daniffs tend to get along great with other dogs and animals with proper socialization. Daniffs can be protective and often make great watch dogs. Life Expectancy: Average life expectancy for the Daniff is 10 - 13 years.