Myth:
Cats are happier and healthier when they are outdoors.
This is not necessarily true. Many cats are happy being outside at certain times, especially when the weather is good. [On a leash or safely enclosed area.] However during bad weather – they would prefer to be inside. Cats are defiantly not healthier when outdoors. The average lifespan of strictly outdoor cats is estimated to be approximately 1 year of age; indoor-outdoor cats about 3 – 6 years and indoor only cats have an average lifespan closer to 13 – 15 years.
Source: www.petplace.com