The short answer
Nearly every dog can do some form of scent work. Dogs have a very strong sense of smell. They have hundreds of millions of scent receptors compared with about six million in humans. That means a dog of any breed, size or age already has what the game needs.
What varies is how fast they learn, how they cope with new places and what they enjoy. A beagle may race. A senior dog may move slowly. A nervous dog may need a quiet room. All of them can play.
At Scentsible K9, scent work is where almost every dog starts. See our scent detection page.
It also helps to know why this works. Scent work taps a natural behavior, so you are not teaching the dog to sniff. You are teaching them that sniffing now has a purpose and pays off. Most dogs find that very rewarding, and that is why it is such a good fit for so many.
Two quick myths to drop. First, you do not need a "working breed." Second, you do not need a perfectly behaved dog. A dog who pulls on the leash, jumps on guests or barks at the door can still learn to search a box.