A chew necklace is a necklace that is worn around the neck with a chew in it. The chew necklace is a way to keep the teeth in good condition and the smiley is a way to help the teeth look happy.
The benefits of chew necklaces are that they help to improve cognitive function and memory, and they are also known to boost the immune system. These benefits are likely due to the fact that they help to chew on pieces of prey, and the act of chewing on food can help to break down and digest food in the intestines. This in turn can help to improve the overall health of the animal itself and the environment around it.