Dog Mysteries, Revealed!

Dog Mysteries Revealed!

Anatomically and physiologically our canine friends share a lot of common characteristics with other mammals, including humans! But some of their behaviors and physical differences leave us scratching our heads asking, “Why do they do that?” and “What function can that possibly serve?”. Let’s answer some of those questions and as always, I welcome feedback and am happy to answer any of your canine queries.

Why the wet nose? Dogs’ ability to detect scents is up to 10,000 time more sensitive than the human nose.  As an example, they can sniff out one rotten apple among 2 MILLION barrels of apples. A wet nose enhances the ability to trap olfactory chemicals in the secretions produced in the glands of the nose. Some

wet nose

dogs lick their nose, contributing to the “wet nose” look and enhancing the process of scent detection as those chemicals are processed in olfactory centers in the roof of th


eir mouths. Dogs’ also produce more secretions from their nose as a way of regulating body temperature.  Sweat glands are found in the feet and nose and as such, a wet nose helps keep them cool. Should I worry if my dog has a dry nose? Nope! If the dog is otherwise happy and healthy, without dried discharge around the nostrils, a dry nose is not an indicator of illness.

Why does my dog pant? We are back to the unique distribution of sweat glands in your pup and his ability to cool down. Because they don’t sweat like humans, excessive heat is lost as air moves through your dog’s airways. While normal respirations in dogs can be up to 30-40 breaths per minute, a panting dog can exchange air up to 300-400 times per minute.  Some causes of abnormal panting can include stress, pain, endocrine diseases, heatstroke, and heart or respiratory disorders such as tracheal collapse.  If your dog doesn’t need to chill out in a warm environment, bring abnormal panting to your veterinarian’s attention.

Why does my dog eat poop? This is a gross one, especially if you witness the event and then your dog wants to plant a big, sloppy one on your lips. From an evolutionary perspective, dog moms eat the poop of their young pups to keep the den clean and free from odors that may attract predators. Some puppies bring this behavior to their new home, though most grow out of it as the dog matures; if they aren’t on a well-balanced diet or experience digestive disorders such as intestinal parasites or pancreatic disease, the behavior may persist.  Some dogs eat stool (coprophagy) because they are stressed, bored, like the attention they receive, even negative attention, or to avoid punishment.  Some dogs eat poop just because they like the taste! Discourage the opportunity to eat stool by picking up poop immediately after defecation or taking your dog outside to defecate on a leash.  A sprinkle of meat tenderizer or a product called Forbid on their kibble make stools less enticing. dog-eats-poop-cover-2

Why does my dog have a tail? And why are they always sniffing each other “back there”? The rear end of your dog is confounding place.  Anal glands, which secrete a foul-smelling liquid are used for scent marking and identification. Because of their complex olfactory system which includes a component called Jacobsen’s organ in addition to their nose, they can also process scents that have no detectable odor like pheromones. A butt sniff is the equivalent of a human handshake enabling dogs to recognize each other as individuals and identify sex, age, variabilities in health and social order. Dogs also communicate using body language and physical cues; raised, waving tails indicate happiness and tucked tails appear when fearful. A wagging tail can help to spread those chemical scents when greeting other pups. Tails are useful for balance and movement, such as the rudder-like tail of the swimming retriever or the whip-like tail of the sighthound which helps them change direction in the blink of an eye.

How come my dog spins in a circle and scratches before lying down? Back in the days before fluffy pillows from Costco, dogs had to make their own bed.  By flattening the grasses and brush for themselves and their young, they made a comfortable nest and drove out critters such as snakes.  Scratching imparts a scent to their bed expressed by the small glands in the feet, further defining the space as their own.

While we’ve domesticated pets, some of these instinctual behaviors and functional anatomic features are part of what makes dogs such fascinating creatures!

by Dr. Lisa McIntyre



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