Why does smell have such a strong influence on a dog's appetite?
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In dogs, smell comes before and determines taste: before even chewing, the nose evaluates the freshness, fat content and protein richness of food, triggering or preventing salivation and the urge to eat. A poorly functioning nose eliminates this crucial first step, which explains the sharp drop in appetite seen in a dog with a cold or an older dog.
Volatile molecules that speak before the mouth
A dog's taste perception is based on far fewer taste receptors than in humans—only a few thousand taste buds. This relative shortfall is made up for by smell: aromatic volatile molecules released by food travel up to the olfactory epithelium and allow the dog to identify the nature and quality of food from a distance. A meal that is lukewarm or slightly reheated releases more of these volatile compounds than cold food straight from the refrigerator, which is why warmed-up wet food is often more appetizing than a portion served chilled.
The link between aromatic volatility and appetite is particularly strong in puppies and older dogs, whose sense of smell may be less effective or temporarily impaired. When the nasal passages are congested—by a cold, chronic inflammation, or simply age—aromatic molecules no longer reach the olfactory receptors properly: the signal for "desirable food" is no longer sent, and the dog may refuse a meal that is both nutritious and familiar.
Loss of appetite as a warning sign
A dog that suddenly stops showing interest in its bowl with no other change in its surroundings deserves careful attention: the cause may sometimes be simply a blocked nose, but prolonged loss of smell can also accompany a more general disease. It is recommended to consult a veterinarian if the refusal of food persists beyond twenty-four to forty-eight hours, in order to rule out an underlying condition requiring treatment.
