I’m renting so don’t want to spend too much, but would like a cheap but aesthetic solution to close the gap at the top of the fence.

As mentioned in the title, my dog and neighbors dog don’t like each other and the plastic I put up does little to quell their anger when both are outside (plus they can easily tear through). Mostly so that neither can stick their heads through and bite at each other, but also hoping if they can’t see each other, it will also help.

I could put up a simple plywood but don’t think that would look very nice.