So, do you have any idea what I could do with it in the winter, like a garage or something?
In winter place it in a spot out of the wind, against your house. When having a lot of snow, put it around the tree, so snow will isolate it, keeping it save.
Lots of plants are coverd with snow for months, before they see daylight again.
Ficusses are the more easy plants for indoor. For example: Ficus tigerbark, it has a nice bark texure and does not mind if it is dry for a few days or wet. When dry it drops some yellow leaves. For good health, it's still adviced to keep it outdoors during the summer, so it can get enough energy stored, so it will still look nice during the longer/darker winter months.
This; Also, while it is outside will rabbits or squirrels go after it?
Someone else have to answer that, as i live in the city with no wildlife around, so i have no experience.