Why dogs smell?

Dogs all have smells, which is an important part of the animal world. Just as predators use scent to identify threats, predators use tiny scents to track their prey. We humans also have our own scent, which is why dogs can use scent to track prisoners and find missing people. The smell that dogs identify is usually the smell emitted by the anal glands, which is why owners often see dogs sniffing each other's butts.

Dog hair smells worse when it is wet

Mammalian sense of smell is a complex interaction between odor molecules and receptors in the nose, which transmits odor information to our brains. The interface between the receptor and the air is a mucous membrane into which odor molecules dissolve from the air before reaching the receptor surface. When a dog is wet, the olfactory receptors are more likely to detect the wet "dog smell" molecules, which then pass through the mucosal layer to the binding site and transmit the information to the brain.

A particularly strong smell on a dog indicates a health problem

Dogs do have a smell, but a particularly strong smell indicates that there is some problem with the dog's body. For example, if the number of fungi and bacteria on a dog's skin increases, it is likely to have skin diseases; if there are problems such as dental plaque and calculus in the dog's mouth, it will suffer from bad breath; if the dog's anal glands have not been cleaned for a long time, the anal glands will become inflamed. Produces odor, etc. If a dog has these problems, the dog will still smell bad even if the owner bathes it regularly.