While there are variables, such as wind direction, strength and sustained flow, there is solid, established, evidence that some creatures, notably carrion feeders such as vultures, are able to detect very small particles of a scent (decaying flesh as an example), down into a very few parts per million. Vultures are not primarily sight feeders, but can detect and react to a scent, under favorable conditions from miles away.
Depends on the breed. Hunting dogs can scent you from farther away than a non-hunting dog. Example: If you have a (let's say) beagle and a miniature schnauzer, the first one to scent you will be the beagle.
It all depends on the breed and age of the dog. Also depends on the scent, but yes, some dogs can such as the blood hound.
It depends what tipe the dog is. A bloodhound can smell a human .3 or .4 miles away but if it is tracking the human it can smell a 3 day old trail.
up to 3 miles
4.5 not sure. But i'm close
Sharks
The average dog has more than 200 million scent receptors
A female dog will never lose her distinct scent. The particular scent of her being in heat, however, ended immediately with the surgery.
The police dog tracks a criminal by scent.
you give the dog the scent and they can know the scent of the animal the master is ordering him to find
Keep in mind that what you think is stinky, is very different to your dog. Usually, a dog who rolls in some other scent is trying to either wipe out that scent by putting his own on it, or is trying to pick up that scent for reasons only known to dogs.
Female dogs give out a scent when they are in heed. Heed is when a female is in a position were that is the only time they can mate. So they have a scent that the Male dogs can smell that scent. Also it is in their Urine.
Yes, dogs have such a good sense of smell, they can even tell what gender, what age, what breed, if it is healthy, and if it is happy.
you evaluate them by how well they sniff
Bloodhound
air freshener
Katts and Dog - 1988 Scent of Evil 2-19 is rated/received certificates of: Canada:PG USA:PG
In fact the the dog is smelling places where other dogs have urinated. The smell that a dog leaves is called a scent. It tells the dog that another dog has been there and has marked its territory. It can tell the dog if other dog was a male or female.If the dog has sniffed the scent, it will leave its own message by urinating there.