One day I hope to own a ferret. They live over 7 years usually. 
I think they usually have strong odor?
They can smell if not taken care of or have health issues. They are commonly known to have several distinct health problems. 
Aww, that is sad and they do not live long at all.
Up to 10 years but they have been domesticated for at least 2,500 years. 
That is a really long time. I cannot picture people back in the day owning them as pets.
Ferret
The ferret ("Mustela putorius furo") is the domesticated form of the European polecat, a mammal belonging to the same genus as the weasel, "Mustela", in the family Mustelidae. Their fur is typically brown, black, white, or mixed. They have an average length of , including a tail, weigh about , and have a natural lifespan of 7 to 10 years. Ferrets are sexually dimorphic predators, with males being substantially larger than females.
The history of the ferret's
keep his coat tidy. A Kuvasz should not smell or have an odor; such is usually a sign of illness or a poor diet.
Health.
Although generally a healthy and robust breed which can be expected to live approximately 12–14 years, the Kuvasz are prone to developmental bone problems. Accordingly, owners should take care to provide proper nutrition to their Kuvasz puppy and avoid subjecting the puppy to rough play. As with many large breeds, hip dysplasia, a painful and potentially debilitating condition, is not uncommon.