The high energy stage does pass, but during this period you do need to provide proper outlets for their energy level. (norcalbulldogrescue.org)
Dogs who aren't given proper outlets for their energy will often find their own, less than ideal, outlets. (leerburg.com)
Without proper outlets for their energy, a bored Flat - Coated Retriever may resort to digging in gardens, chewing or other nuisance behavior. (puppiesndogs.com)