Jane Killion wrote an very interesting article about how puppies will have larger brains and be more emotionally stable if you raise them in an enriched environment. More information about this article can be found here: https://www.puppyculture.com/new-enrichment-effect.html
To sum up the article however it was found that Animals brought up in an enriched environment show the following in comparison to animals raised in standard laboratory conditions:
•Larger brains
•More new brain cells and neural connections
•Better brain cell survival
Additionally, they found that the physical changes in brain structure also resulted in the following intellectual and emotional benefits:
•Improved ability to learn and remember
•More emotional stability
•Better resiliency to stress
You can learn more or purchase the Puppy Culture protocols here: https://www.puppyculture.com/?a_aid=57ee895db898d