Arrange the treats and toys in the bucket or Tupperware. Choose treats and toys that will offer a variety, with some expected to sink and others to float, providing an engaging mix for your dog to discover throughout the ice.
Fill the container with water, ensuring that the toys and treats are submerged. If you have a lid, use it to keep any floating items submerged in the water.
Freeze the container until solid, which should take about 6+ hours.
When it's time to serve, allow the container to thaw for approximately five minutes to ease the ice from the sides of the container. Remove the lid.
Place the pie pan or a similar container, with sides short enough for your dog to comfortably lick the ice, on top of the ice block. Flip the bucket over so the "ice cake" is positioned within the pie pan.
Set up the ice cake outside in a shaded spot. Make sure to point out the exposed treats to your dog, so they know there's something special for them. Enjoy the summer!