Dog sets off CO2 detector

I have an Aussie who loves to lay against the CO2 detector (cause I have the a/c vent pointed downward).  Unfortunately, he routinely sets off the CO2 detector.  Not an issue if we’re awake but when it happens at 0100 it’s a real bummer.  If I remember I set a pair of shoes on top of each other in front of the detector.  Looking for something with a bit more class.  My wife thought a small mesh basket like a strainer for noodles or something similar.  Mesh allows free air flow but with a 1/2 to 1 inch stand off it would prevent the Aussie from laying against it.  I would attach it with Velcro so it was easy to remove when I needed to replace the batteries, system checks, etc.  I’m tempted to ask my son to design something in CAD and print it on his 3D but before that, thought I would hit the forums and see if anyone has experienced the same issue and had a solution.