Refers to the act of sniffing around, often used in a context of investigation.
El husmeo de los perros les permite detectar olores a grandes distancias.
The sniffing of dogs allows them to detect scents from great distances.
El husmeo de los perros es esencial para detectar olores y encontrar su camino.
The sniffing of dogs is essential to detect scents and find their way.