Why Is My Dog Sniffing Everything All Of A Sudden. Basically they reconfirm their familiarity this way. Although they are comfortable with you, if you sniff them they may become slightly alert or defensive since it is what cats do when they are unfamiliar with another’s scent.

Learn why the urge to sniff is such a big part of dogs' lives. My dog for no reason has started constantly sniffing, obsessively, himself, the couch, the floor, himself. Sometimes when a dog is bored, it.