According to Purdue University:
"The purpose of enrichment is to reduce stress in dogs and to reinforce socialization practices. Providing a dog with enrichment allows the animal to have a sense of control over their environment, which can help to reduce and avoid stress. There are 5 types of enrichment possible for dogs in kennels: Social, nutritional, occupational, sensory, and physical."
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More info about enrichment can be found here----->
https://vet.purdue.edu/discovery/croney/files/documents/enrichment.pdf