It's not uncommon for a Canine to visit an ole set. #1 their nose, #2 location (in their line of travel).
Over the years, after I pulled sets, I revisited some locations either in Deer season, calling or re-setting.
I found droppings or dug up hole. These sets were on location, not taking anything away from their nose because dug up sets had to have an odor for them to spend time digging.
I think it was the winter of '95-'96...Remember we had record snow fall? Barn roofs were caving in, store roofs fell, other buildings fell. What a winter!
I was winter trapping and gave in to snowfall after snowfall. It was hard work keeping sets working.
I pulled all sets but 1. The double set was on the wrong side of the fence row and was under a 6' snow drift.
This set was near our home and I drove past every day. In Mid-March, on a Friday, the snow pealed back to were I could retrieve my traps. Good, I thought, tomorrow I'll get my traps.
Saturday morning I drove up the field and saw a Red bouncing around. It can't be...It was. That trap was buried for 3 months, One night it was exposed and caught a male Red.
I tailed him, grab the back of his neck, stepped on the springs and released him unharmed. Watched that bleached out, yellowish Red trot away for hundreds of yards.
Did the snow pack keep the lure/bait fresh? I have no clue.