Believe it or not, your dog doesn't use both nostrils the same way, each has a different job

Your dog doesn't use both nostrils the same way. Veterinary behavior research shows dogs often use the right nostril first to assess new or unfamiliar smells, then shift toward the left nostril as the scent becomes familiar. This unique dog sniffing behavior reveals how the canine brain processes emotion, safety, and recognition.

Raccontata daeconomictimes.indiatimes.com