This food puzzle is quite interesting because you have a lot of say in the degree of difficulty. This puzzle comes with pegs you can use to lock the tower so that only some or all of its sections can move. You can nearly trick your dog to try and figure out which section will move each time, and perhaps make it so that the way for them to get it to move is by looking at you or sitting first!

Just like with most puzzles, the fewer food/treat pieces you have your dog work for at a time, the better. That way their success is based on their skill set, rather than a high probability of multiple pieces being everywhere.