How does testosterone affect dogs?

Testosterone has significant effects on dogs, particularly concerning behavior and physiological changes. As discussed by Andrew Huberman, after a dog is castrated, the removal of testosterone leads to changes in behavior and health conditions. However, reintroducing a small amount of testosterone can positively transform the dog back to a version of himself observed previously. This change is not just an amplification of a system but a modification, impacting the dog’s health and behavior markedly 1.

This indicates the pivotal role testosterone plays not only in reproduction but in maintaining the general wellbeing and behavioral stability of dogs.