I would like to make it safer but I live at home, so feel bad of changing. When I’m planning after being done with my studies and move to an apartment. I have foxes in my area and also hawks, eagles and my neighbors dogs. But, also a cat that will patrol the yard and spend a few hours with the bunnies. Most people that own dogs in my area, let their dog run lose without leash because I live next to a forest (2 min walk from my house). But my dad it’s always home and their cage it’s near our bedrooms. So we can hear them if they get scared. We also installed a lamp that will get turned on if something of the size of a cat move onto the yard during the night. Myself have seen rats and mouses but never near the rabbits cage. So there are a lot of things to think about. The net on cage will only keep birds away because they can see it from a distance. Creating a safe space for them, but if it was a permanent cage, I would build a real run instead. One of my bunnies can’t be indoors, she became really stressed and aggressive. She literally messed the whole house during nights. She only became calm outdoors. The other bunny was really scared of humans, being outdoors helped him to slowly get used with humans and learn to trust people. He will soon become an indoor bunny. I always fill their hole up when it become too deep or dig the wrong way. They can never disappear under the ground. I remember couple of years ago with my first bunny, my dad ran out with a broomstick in the middle of the night with only his underwear to chase away a fox from the yard. Because my bunny started to thumping in the cage, waking everyone up. That was the last time the fox came to the house, that bunny only lived to 8 years (passed away because of GI stasis). Myself also have to vaccinate all my bunnies and watch everyday after ticks. At least I don’t have to worry about snakes because they’re only exist one venomous snake and there only exist 3 species of snakes. So it’s not completely safe having my bunny outdoors, I can only make it as safe as I can. Most people often use dog run to build the pen for the bunnies. My neighbor have done that with mesh on top, it become a lot safer. They will often have soiled ground or mesh on bottom of the run.