I had a couple inquiries as to where folks could buy the three-holed cored bricks that I brought to a recent set of classes at EFPSudbury. This where I bought mine.
Landscape Depot Supply
350 Irving Street
Framingham, MA 01702
Phone: (508) 620-2988
Hours: Mon – Fri: 6:30am – 5:00pm
Sat: 6:30am – 3:00pm
I use about ten bricks. One brick is hot and the others are neutral and, during training, I shift the bricks around like a Shell Game. I also have some bricks that have ten, smaller holes that I bought at Lowes and I use those bricks for more advanced dogs. But, I use the three-holed bricks when first transitioning dogs from big boxes, where the dog just needs gross-motor skills to find the hot box, to smaller containers and other items which require more accuracy from the dog. Initially, it is sufficient that the dog just find the hot brick but, over time, we ask the dogs to identify the exact hole containing the hide as their fine-motor skills develop. The bricks, being heavy, are less likely to be picked up or pawed by the dog.