You want motion detectors, but there’s a problem. You have pets. What can you do when your cats keep setting your motion detectors off? This is a problem with a lot of traditional motion detectors, but there are some new and improved motion detectors that can be calibrated appropriately for pets. It may just take a little additional work. Here’s everything you need to know about pet immune motion detectors.

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Pet Immune Motion Detectors

Pet immune motion detectors are designed to prevent false alarms when pets are moving around the home. These detectors are set to ignore the motion of animals based on their size, from small, 15 pound cats, to large, 80 pound dogs. Of course, it should also be considered that a system that is calibrated to ignore 80 pound dogs could potentially be less likely to notice a burglar. 

Often, homeowners with pets don’t set their home’s security system fearing their pet will activate too many false alarms, which could result in hefty fines or being placed on a “do not respond” list by authorities.

Not all systems have pet sensor options, which means you may need to look for a specific security solution for your home.

How Do Sensors Work with Pets?

There are different types of sensors. Some sensors send out waves at intervals to detect motion, and if they do detect motion, they will sound an alarm. Many of these systems actually won’t catch a cat or a small dog, because they are looking for large objects and because they are looking at intervals. But these types of alarms commonly come with some drawbacks, such as giving out false alarms if something in the room moves (for instance, a dog moving a chair).


Other sensors sense heat, in which case a large dog may appear to them as a person. These systems can be designed not to sense things that are smaller than the average human, but this still carries with it some risks; for instance, children breaking into a home may have the same mass as a large dog.

In general, the smaller the animal and the more erratic its movements, the easier it is for a system to ignore. Pet owners who have cats will usually find it easier to find an acceptable sensor system than people who have very large dogs. At the same time, people with very large dogs also have the dogs themselves as a security solution.

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Adding Extra Security Around Your Home

Because you may not be able to have as reliable motion detectors in your home, you might want to add detectors outside of your home. Some things to protect your home and your pets at the same time include:

  • Closing off rooms that the animals don’t need and putting motion detectors in those rooms.
  • Putting sensors and high visibility security cameras outside of your home.
  • Installing sensors at doorways, windows, and other entryways.

In short, creating a comprehensive security system is the best bet when you have pets. Though you still can have sensors, the sensors may be less sensitive overall, making it a good idea to have some backup security around your property.

Pets may set off motion detectors, but pets such as large dogs can also provide security in and of themselves. With more advanced motion detecting technologies arising, it’s possible to get a motion detector that can be specially calibrated for your pet. Contact Protect America to find out more.