The amount of filler you use can be adjusted. Less for example makes the heat pack softer and able to be used to focus on smaller areas on your body.
Keeping a cup of water in the microwave next to the sock will slow down the heating process.
If you want the cozy to bunch up a little, add extra length to your calculation.
Fabric glue requires you to place a heavy object, such as a book, on top of the sock and let the glue sit for an hour.
It is a good idea to apply a little bit of fabric glue around the edges of the hole to protect the threads from fraying.
If you want the dog to get the object out right away, such as with a treat, don’t tie the sock. Bunch the sock into a ball.
Some dogs may consume pieces of the sock, which can lead to bowel blockage, so be careful and opt for smoother socks. [9] X Research source