I've got a blue tick beagle (he's amazing:
https://www.instagram.com/elvisrufflife), we recently had a friend up to our house in the woods and they had their dog run away from them on a walk the first morning they arrived. Over an hour later, i leashed up our beagle, started where their dog got lost by pointing at a few of her footprints and...away he went (on leash!). We followed a trail (that i could not see) for about an hour, i was convinced he was just tracking a deer or something unrelated. Eventually the trail lead to a road a few km away from the house where we met some other people walking their dog, i asked them if they had seen a black dog and they instantly responded with "Yes, we saw a dog 10 minutes ago".
I knew he was smart, but it's next level impressive what he can track. Our dog has had no formal training , i got him as a rescue when he was about 18 months old. He can do all the standard tricks, and apparently track things? I'm certain he knew what i wanted him to do, it was an odd form of communication but he seemed very excited with the assignment he was tasked with.
The kicker to this story is that our friends dog came back to our house all by itself about 5 hours later. We spotted it once during our hunt, but being a rescue street dog from Forida, she's pretty skittish and just ran away any time she was approach by another person.