dogs can smell how far

Dogs have an incredible sense of smell, and their ability to detect scents can vary depending on several factors, including the breed, training, and environmental conditions.

Generally, a dog’s sense of smell can detect scents that are:

1. Up to 10,000 to 100,000 times weaker than what humans can detect.
2. Several miles away: Some breeds, such as Bloodhounds, can follow a scent trail that is several miles old and several miles away.
3. Underwater: Some dogs can detect scents that are underwater, although this is less common.
4. Buried: Dogs can detect scents that are buried under several feet of soil or debris.

In terms of specific distances, here are some estimates:

* A Bloodhound can follow a scent trail that is:
+ Up to 3 miles (4.8 kilometers) old.
+ Up to 5 miles (8 kilometers) away.
* A German Shepherd can detect a scent that is:
+ Up to 1 mile (1.6 kilometers) away.
+ Several hours old.
* A Labrador Retriever can detect a scent that is:
+ Up to 1/2 mile (800 meters) away.
+ Several minutes old.

Keep in mind that these are general estimates, and a dog’s sense of smell can vary greatly depending on the individual dog and the specific circumstances.