Set camera to alert me to motion even when system is "off"

Is there a way to set a camera to alert me when it detects motion, even when the system is set to "off"?

Specifically, when I'm in my home office, I want to know if/when one of my mischievous dogs ventures into a certain room. So I won't have the system armed. I just want an alert when Fido wanders where he's not supposed to be.

Any way to do this?

Thanks.
Ken