Ring of The Bloodhound (3.5e Equipment)
From D&D Wiki
Ring of The Bloodhound: This ring is decorated with workings of bloodhounds chasing a trail. It grants its wearer the scent ability, a extraordinary sense of smell. He gains a +4 competence bonus on Survival checks when tracking by scent. The ring does not grant the Track feat.
Moderate transmutation;CL 7; Forge Ring, polymorph, creator must have the Track feat; Market Price: 26,950gp