As most of you probably know, I have two guinea pigs. Every time I put them out in the garden in their run, a large ginger cat appears as if by magic. I chase him away but he keeps coming back. The other day he was sitting on top of the run with my guinea pigs cowering in their tunnels. Does anyone have any suggestions as to how I could deter him? I bought an electronic device, but my son can hear it and says it is very unpleasant.. I don't want to put down repellent granules, because the guinea pigs might eat them. I have heard that cats don't like oranges-is this true? Any ideas would be gratefully received. Thank you.