Motion sensor detecting a cat

I've set the motion setting to people only...and get alerts every couple min as the stupid cat suns itself, and I had to turn off the alexa skill because every couple min I get a motion alert for it.I turned off people only and set it for the lowest motion detection and it still picks up the stupid cat. So I don't know what the motion sensitivity is supposed to do but just about worthless as far as I can tell.And trying to figure out how to say that it's not working took me 15 min of running around the site. Not real happy right now.