Not sure this is the appropriate section, but this seemed the best for what I could find?

I swear I seen a fox near the coop tonight? Not sure, it moved to darn quick, and I was in the house? It was light brown, with white on it, but could have been a big cat, and I mean big cat, but it moved to fast for the feral cats around here?

Any suggestions? Ideas? I feel I have a pretty secure coop, but until something tests it one never knows?

I know I am new to this site, but would really like any advice anyone can give? Thanks in advance...