There are several reasons that cats sniff each other. Cats use their sense of smell to identify other animals and people. A cat’s nose has oil-producing glands on it, and the scent is deposited when the animal “sniffs”.
why do cats sniff each other?
Cats also may rub noses together or touch each others’ faces with their own as a friendly greeting behavior. In addition, cats will often sniff around areas where another cat has been – this is part of the feline communication system since all cats have an individual scent that can be identified by other members of the family group.