ENS Fact Sheet

What is Early Neurological Stimulus (ENS)?

ENS in puppies stands for Early Neurological Stimulation, a brief daily program of mild exercises used during a critical developmental window to boost long-term health and stress resilience. 

Originally developed by the U.S. military for its working dog programs, the practice is now widely used by American Kennel Club and other professional breeders. 

The ENS Timeline and Exercises

ENS must be performed strictly between the 3rd and 16th days of a puppy's life, a period when the nervous system is developing rapidly. Each puppy undergoes five quick exercises once per day, lasting just 3 to 5 seconds per position: 

• Tactile stimulation: Tickling or stroking the skin between the puppy's toes with a cotton bud (Q-tip).

• Head held erect: Holding the puppy perpendicular to the ground with its head pointing straight up.

• Head pointed down: Holding the puppy firmly so its head is reversed and pointing toward the ground.

• Supine position: Cradling the puppy on its back with its muzzle facing the ceiling.

• Thermal stimulation: Placing the puppy feet-down on a damp towel that has been chilled in the refrigerator. 

Potential Benefits

Proponents and early military studies report that ENS kick-starts the neurological system, producing several lifelong advantages: 

American Kennel Club

• Stronger cardiovascular performance and heartbeats

• Improved tolerance and resilience to stress

• Stronger adrenal gland functioning

• Greater resistance to certain diseases

• Enhanced capability for learning and exploration 

Note: ENS is not a substitute for regular socialization, handling, and training later in life, but rather an early foundational tool. (American Kennel Club Accessed: 21 September 2026).

See below how ENS is completed on a puppy from day 3 to 16 days of life.