I'm not sure what you mean by wiring an indoor pet fence. I presume you _aren't_ building an electrified fence indoors, so my best guess is that you're trying to set up an "invisible fence". If so, you may find it very difficult to have the signal trigger only in that one place; those things really aren't intended for indoor use.As far as wire overlapping: Sounds like a short?
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explain further alas my crystal ball is rather dim at present.