We collected some tiger and cheetah poo from the nearby zoo yesterday, was quite disappointed when we got there as we were told that we would have a weeks worth of poo to collect, not knowing how much tigers poo we were expecting quite a bit, but we were presented with a tesco bag. Apparently they don't poo much!
Anyway when we got home, we thought we would let the dogs have a sniff, just to test it. Our Newfy spent an hour barking and growling at the bag whilst keeping a distance from it, and the collie hid. We reckon thats a pretty good sign that it will help keep the fox away!!