Diy Rfid Pet Door . Mack tech’s d o g is a big thicc boi, and needs a big dog door — easily. The door is a plexiglas flap hanging on. PlexiDor Performance Automatic Electronic Door Mount Cat / Dog Door from petschoicesupply.com Have your pet stand and measure from the floor to the top of their withers. Before we can talk about the programming of the motor, we need to build support for the feeder. Autoslide ilock smart tag pet door.