Outside is where all the fleas, ticks, hairballs, worms, and diseases are. My vet said that indoor ones are healthier. This is interesting.
I always had my pets vaccinated and or treated for outside pests it's easy to do and is what you have to do to keep them healthy. The point my uncle (the Vet) was making about indoor verses outdoor animals is that when a pet is kept indoors they don't have a chance to go through the natural process of thickening up their fur for the winter months or properly shedding for the summer months. When they are sent outside to potty or for a walk to keep them exercised they catch cold easier in the winter months just like we do however they don't have a "coat" to put on to keep them warm. He saw a lot of sickly pets because of that.
Hairballs? LOL Gotta watch those hairballs out running around!