A dog's sense of smell is 10,000 to 100,000 times better than ours (depending of the breed). Dogs can detect odors in parts per trillion.
Man, a guy I dated in high school used to wear this. Sometimes I still catch of a whiff of it and it reminds me of him. I also had a friend who would use this specific beard oil, and I catch that scent from time to time. Smells have a unique ability to transport you.