What affectionate nickname has the Flat-Coated Retriever earned due to its tendency to maintain youthful exuberance into adulthood?

Answer

"Peter Pan" of the retriever breeds

The breed is affectionately nicknamed the "Peter Pan" of the retriever breeds because of its hallmark characteristic of retaining a playful, youthful exuberance long into its adult life.

What affectionate nickname has the Flat-Coated Retriever earned due to its tendency to maintain youthful exuberance into adulthood?
Dogbreedlineagecoatretriever