8-3/8" Tall Wooden Fire Hydrant for Puppy Training Screw the metal stake into the bottom of this 8-3/8" tall x 3-3/8" dia wooden fire hydrant replica, stick it in the yard and watch your puppy learn how to piddle on this instead of the leg of the coffee table. Or a guest. Philip thinks these would be dandy tee-box markers for a fireman's golf outing, but then he thinks that way.