you can always set the beam higher than most dogs,cats raccoons. My beam goes from my window eave to the back of my mailbox so at the driveways its about 4feet and at my walkway its 5feet. It get everyone who pulls or walking into the drive from the street and anyone who walks at least halfway down my walkway. Critter under 3.9ft get a pass. There is an audible 30 second ticker sound to let them know they were detected as well as the front and rear porch lights come on for 1hr.
Life is a web woven by necessity and chance...