The dog's naval cavities and nostrils are made up a complex system of bones-such as like a web. This increases its surface area in which it can contact smells, so this is also why dogs have such a keen sense of smell.
When his nose is dry? It has a dry nose. The "dry nose = sick dog" is just a myth. It could be dehydrated though, or it could be too hot or too cold. A dry nose is usually nothing to worry about. If you're concerned, go to your dogs vet.
No, they are not leather. Leather is what you get when you tan an animal hide; tanning is a process that is done to hides after they are removed from the animal. Dogs' ears are typically called 'leather', but they are not real leather either.
its a rubbery substance
No, not all dogs have black noses. Some dogs have pink noses, or even white. Some dog's noses are black to keep their nose from getting a sunburn.
Because that how they were made why do bulldogs have flat noses
Most puppies/dogs have wet noses and sometimes they get dry but not for long wet noses are a good sign
No, that's only a dog trait.
Bull terrior
yes
No; some dogs naturally have dry noses and your dog may be perfectly healthy.
maybe BloodHound dogs have strongest noses.
the noses to help it smell and they are the smallest dog in the word
They have way more receptors than we do in their noses.
Possibly nothing - a dry nose does not mean your dog is sick.
It is a sign that they are healthy. I am pretty sure they lick their noses when they are well, and when they are sick, they will not. So don't worry if your dog's nose is wet- it's a good thing!