Dogs have 220 million olfactory cells so they do what better than humans?

Dogs have approximately 220 million olfactory cells, which is significantly more than humans. This allows them to smell much better than humans.

Here's how their superior sense of smell manifests:

* They can detect much fainter scents: Dogs can detect scents that are 10,000 to 100,000 times weaker than what humans can smell.

* They have a wider range of scents they can detect: Dogs can identify and distinguish between a much larger variety of scents than humans.

* Their noses are specialized for sniffing: Dogs have a special structure in their noses called the "olfactory epithelium" which contains the olfactory cells. This structure is larger and more complex in dogs, allowing them to process scents more effectively.

This superior sense of smell is why dogs are used in various fields, including:

* Detection of explosives and drugs: Dogs can detect these substances with incredible accuracy.

* Search and rescue: Dogs can locate people trapped in disasters by smelling their scent.

* Medical diagnosis: Dogs can detect certain medical conditions, such as cancer, through their sense of smell.

* Therapy and companionship: Dogs provide emotional support and companionship to humans.

So, the answer to your question is that dogs have 220 million olfactory cells, which allows them to smell significantly better than humans.