Dogs are the main sense organ of the people more than the eyes are a step ahead of us. We perceive the world primarily as physical appearance. This is reflected in our language: “Let’s see”, say we wait. A dog would say: “we smell times”. The nose is the main sense organ of the dog, and as we can see every detail of our environment, the dog can smell it. If a bud will blossom soon or whether a sheet has been nibbled at by insects – the dog smells, what we see.
With a bit of practice he can find two grains of sand from about a thousand cubic meters of sand. This corresponds to half a kilometre sandy beach. A half teaspoon of sugar in an Olympic-size pool full of water does not miss his nose. The olfactory epithelium in the dog’s nose is many times larger than ours. And although our brain is ten times as big as a dog, a larger area of the processing of olfactory information is dedicated in his brain.
His olfactory epithelium bind scent molecules to receptor proteins, some of which he Hundreds more features as we. Thus, the sensitivity of his nose is not only unbeatable. He can distinguish a much larger number of different scents. With this sense of smell dogs amazing services are capable of: old hat is that they collect information on the lamppost over their own kind. Also, that they can sniff out with their sensational nasal drugs, explosives, or mold. Dogs can smell but also emotions. When excited, our body reacts without that we have an influence on it, with increased heart rate, perspiration, or the release of pheromones. The flow rate with the fragrance molecules emitted at the surface of the body is changed by the accelerated pulse. It can smell the dog’s nose. Dogs can detect on a track in which direction it was gone. You are guided to biochemical and microbiological degradation products that are emitted from injured plants. Meet the five steps or a period of one to two seconds the dogs, to perceive the change of odor information (1). Dogs can smell even cancers. You probably sniff the disturbed metabolism of cancer cells. And succeed with tremendous success rate: dogs were trained to identify urine samples from cancer patients. Samples from healthy subjects served as control respectively. The dog s recognized all cancer patients, but showed the sample of a healthy control person without exception. A subsequent investigation revealed that this control person actually was suffering from a kidney tumour (2). (1): Hamilton PG, Wells DL. how many footsteps do dogs need to determine the direction of the trail on odour? Chem senses. 2005 May;30(4):291-8. epub 2005 Mar 1 (2): Willis CM Church SM guest CM, Cook WA, McCarthy N, Bransbury AJ, Mr. Church, Church JC. Olfactory detection of human bladder cancer by dogs: proof of principle study. BMJ. 2004 Sep 25;329(7468):712. Lyn Zaib