Sniffer is a passive mob that does not spawn naturally. It can only be hatched from Sniffer eggs, which are found in suspicious sand from warm ocean ruins. Sniffers are known for their ability to sniff out and dig up ancient seeds, specifically torchflower seeds and pitcher pods, from dirt, grass, and moss blocks. Sniffers do not drop any items when killed. Sniffers can be bred using torchflower seeds. When two sniffers are fed torchflower seeds, they enter love mode and may produce a Sniffer egg, which hatches into a baby Sniffer. The Sniffer egg is laid as an item, meaning players must place and wait for it to hatch.

Sniffers are passive mobs and do not attack the player. They wander aimlessly, avoiding hazards and obstacles. Occasionally, they smell their surroundings and begin tracking ancient seeds by pressing their nose to the ground. When a Sniffer detects a seed, it performs a digging action and retrieves either a torchflower seed or a pitcher pod, with an equal chance of getting either one. Sniffers can also be attached to a lead, allowing players to transport them easily.