We have way too many squirrels coming into our yard running long the top of our fences, using them to get into the yard, running along the fence tops and driving our dog crazy. Any ideas on a humane treatment to the top of the fence that might deter squirrels from landing or running on them? One that wont be too noticeable? That would help keep our dog calmer (good thing for the chickens stress levels), our yard nicer and hopefully keep them out of the chicken feeders. Thanks! Jeannie.