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Pet Grooming
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Dogs &
Open Car Windows
Experts
estimate that dogs can catch a whiff of something that's one million
times less concentrated than what humans can detect. With so much sniff
power, it's hardly surprising that they stick their heads out car
windows. They could care less about the scenery. What they're after are
smells.
If you're driving through town at 30 miles an hour and your dog has his
nose out the window, he knows where the bakery is, where the butcher
shop is, which street leads to the local McDonald's, and maybe even
what the mayor had for breakfast.
Dogs assume a characteristic expression when they put their faces into
the wind: Their upper lips curl, their noses wrinkle, their eyes partly
close, and their ears fold back. It looks as though they're
experiencing a moment of ecstasy (which they probably are) but mainly
they're concentrating. It's as though they're closing down all the rest
of their senses to focus on this one.
There's a world of fascinating scents outside the car. This dog loves
to hang her head out the window and sample every one of them. All dogs,
from huge Great Danes to tiny terriers, have extraordinarily acute
senses of smell. Their scenting ability is enhanced when they are
moving quickly, which is one reason that they take advantage of open
car windows.
Smells are so important to dogs that they have two separate systems for
detecting them. One is the nose system. It consists of a huge amount of
tissue called olfactory epithelium, which is loaded with scent
receptors. This area takes up about 1/2 square inch in humans, but up
to 20 square inches in some dog breeds.
As air moves over the tissue, odor molecules settle in millions of
scent receptors. The more air flow there is, the more scents dogs
detect. A Dog's sense of smell is enhanced when they're moving quickly.
In the evolutionary scheme of things, this probably made them better
hunters because they could load up on scents while chasing prey.
Dogs have a second smelling system that's headquartered in their
mouths. Near the upper incisors is a tiny duct that leads to a
specialized gland called Jacobson's organ. It's designed to capture and
interpret the most primitive types of smells.
Dogs depend on it to identify other dogs, choose a mate, and smell
prey. When dogs scrunch up their faces in the wind, it looks like
they're catching flies, but what they're really doing is catching
scents.
There are more
information articles on all aspects of basics dog training, dog health
issues, dog grooming and dog nutrition in
John Mailer's article directory
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Dogs & Open
Car Windows
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