I need to keep my chickens out of my neighbor's yard. We have an "invisible fence" for our dog (not that brand name, but same thing, buried cable around the property, he wears a collar that shocks him if he tries to leave the yard). If I got very small collars for the chickens (the kind used for cats or chihuahuas), do you think that would work to keep them in our yard? Please keep in mind that I recognize that if this works it still will not keep predators away from them. The collars are expensive but I'm desperate. I've got unfenceable property and we're addicted to 100% foraging chicken eggs. Google has revealed nothing to me about anyone trying this, successfully or otherwise.