Quote:
   | Originally posted by antonye Yes, you need to check your PIR sensors as some are able to distinguish between a cat and a human, so will trigger for one and not the other.
 
 If you don't have the right ones it should be a simple replacement job.
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    Hmmm, simple replacement it should be, but you would still need to lower the PIR to a level of say 1400mm AFFL, which means you'll have alarm cable coming down the wall.
 Not sure on the "pet distingiushing" PIRs, but if the cat moves fast enough then I presume it's signature could be mistaken for a larger object and hence set the alarm off. 
 I've only ever seen one cat friendly alarm in a house with two cats, and that was where there was no PIR's and all window and door contacts.