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.
domestication is uncertain, like that of most other domestic animals, but it is likely that they have been domesticated for at least 2,500 years. They are still used for hunting rabbits in some parts of the world, but increasingly they are kept only as pets.
Being so closely related to polecats, ferrets easily hybridize with them, and this has occasionally resulted in feral colonies of polecat–ferret hybrids that have caused damage to native fauna, especially in New Zealand. As a result, New Zealand and some other
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.