I wasn't sure that wing clipping would be necessary until I found my 22 week old hens standing on top of our 6 foot fence this morning. The dogs next door were going crazy. My problem is that there is a 2-2.5 foot tall retaining wall across the back of our property and the fence is only 3.5-4 foot above that point. If I clip their wings, will that keep them from jumping 3.5-4 feet to get on top or over the fence? Would putting pigeon spikes work?