How far can a dog smell?
How far can a dog smell? How far a dog smells depends on conditions such as wind and type of scent, but they have been reported to smell objects and people over 12 miles away. Dogs' olfactory systems work so well that they can be trained to pick up odors as little as a pictogram which is a trillionth of a gram.
Will my dog remember me after 10 years?
So as long as a dog can smell, has healthy eyes, and can hear, they will most likely remember you no matter how long you've been out of their life. If you are wondering if your dog misses you while you're gone they don't have any knowledge of time but can experience separation anxiety.