We have a fox that is seen every day, opossum, raccoons, my lab and the occasional coyote and do not have any problems at night. My tractor is up on blocks as well. Our lab nosed the fence once and will never do it again.We are raising some red rangers this summer to see if they take the heat better than our usual cornish. We are going to get batches of 150 birds and raise half of them tractored as we usually do. The other half we are going to try raising in larger areas with electric netting. We are still going to use the tractor as a shelter within the netting, but we will have it raised on blocks so they can get in and out. I'm not sure yet about how we will handle things at night though. I'm concerned that the netting won't keep out coyotes and dogs so I am thinking of shutting them up in the tractors at night. Any thoughts on that? Has anyone used just netting at night to successfully keep out predators?
I would think that an owl would be a problem but we have not had any issues yet. The crows have bothered the chickens the most.
Good luck.