I had a system and the cat was not detected.
In ref to a different post on this, if someone got in and nothing was stolen, it could have been one member of a team scouting for goods. Up north, my next door neighbor was alone in the house with her baby. This was an upscale neighborhood. In the middle of the night she heard an intruder in the house walking up the stairs. She pretended to be asleep. He came in sat on her bed and had enough gall to light a cigarette and smoke it. Then she heard a small cry from her baby in the next room. He got up and she could hear him going from room to room then finally she heard the front door close. She could still hear the baby softly making her normal noises so stayed put for 15 minutes. Then, she got up, grabbed the baby and went to her friend's house and called the police. The police said the intruder was part of a team. One would case the houses and where each valuable was located. Later the gang would swoop in and within a few minutes be gone with the goods. (In my case they may feel sorry for how little I have here and leave me something)
If these people are working in teams, this would explain why nothing would appear amiss.
IMHO, a sweet-tempered but really big looking dog with a good snarl beats putting wooden Dowling in the doors.
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