Bloodhound

1st-level transmutation
Casting time: 1 action
Range: Touch
Target: A willing creature within range
Components: V, S, M a drop of ammonia)
Duration: 8 hours
Classes: Druid, Ranger, @wizard
Subclasses:

You touch a willing creature to grant it an enhanced sense of smell. For the duration, that creature has advantage on Wisdom (Perception) checks that rely on smell and Wisdom (Survival) checks to follow tracks.

At Higher Levels. When you cast this spell using a 3rd-level spell slot, you also grant the target blindsight out to a range of 30 feet for the duration.