Sally lives indoors ONLY, except if she is out on a walk with her harness on.
It would be hard to have a dog and cat, and have them go outside at different times. Plus, there are many dangers.
My friend has three cats, all outdoors. I am suprised she still keeps them outdoors because:
One got hit by a car
Two have gone to the hospital after getting in fights with other cats
One got stuck under the porch

And that's just the three they have. Their other kitten was killed by a car at a young age.

After hearing of all these accidents, I will never let my cats outdoors.
To add onto that, we live near the woods, and there are many thingsd that could be hazarous out there; ticks, diseases, possums, etc.